REGRESSION(r175000): Crash in SourceBufferPrivateAVFObjC::destroyParser()
https://bugs.webkit.org/show_bug.cgi?id=137990

Reviewed by Alexey Proskuryakov.

NULL-check m_mediaSource before using.

* platform/graphics/avfoundation/objc/SourceBufferPrivateAVFObjC.mm:
(WebCore::SourceBufferPrivateAVFObjC::destroyParser):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@175083 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Clean up virtual functions in rendering/
https://bugs.webkit.org/show_bug.cgi?id=137984

Reviewed by Darin Adler.

Clean up virtual functions in rendering/ by:
- Making virtual functions final when possible
- Making classes final when possible
- Using 'override' when appropriate
- Explicitly marking functions / destructors as virtual when they are
  inherently virtual
- Dropping virtual destructors when the class does not have subclasses
  and mark the class as final, to get rid of unnecessary vtables
- Making isXXX() virtual functions private on XXX classes to avoid
  unnecessary type checks
- De-virtualizing some functions that do not need to be virtual
- Dropping final for virtual functions in classes already marked as
  final

No new tests, no behavior change.

* html/shadow/SliderThumbElement.cpp:
* rendering/AutoTableLayout.h:
* rendering/ClipPathOperation.h:
(WebCore::ClipPathOperation::type):
(WebCore::ClipPathOperation::isSameType):
* rendering/EllipsisBox.h:
* rendering/FixedTableLayout.h:
* rendering/InlineElementBox.h:
* rendering/RenderBlockFlow.h:
* rendering/RenderCombineText.h:
* rendering/RenderCounter.h:
* rendering/RenderDeprecatedFlexibleBox.h:
* rendering/RenderFlexibleBox.h:
* rendering/RenderFullScreen.h:
* rendering/RenderGrid.h:
* rendering/RenderLayer.h:
* rendering/RenderLayerBacking.h:
* rendering/RenderLayerCompositor.h:
* rendering/RenderLayerFilterInfo.h:
* rendering/RenderLineBreak.h:
* rendering/RenderMarquee.h:
* rendering/RenderMediaControlElements.h:
* rendering/RenderMultiColumnFlowThread.h:
* rendering/RenderMultiColumnSet.h:
* rendering/RenderMultiColumnSpannerPlaceholder.h:
* rendering/RenderNamedFlowFragment.h:
* rendering/RenderNamedFlowThread.h:
* rendering/RenderQuote.h:
* rendering/RenderRegion.h:
(WebCore::RenderRegion::renderName): Deleted.
* rendering/RenderReplica.h:
* rendering/RenderRubyBase.h:
* rendering/RenderRubyRun.h:
* rendering/RenderScrollbar.h:
* rendering/RenderScrollbarPart.h:
* rendering/RenderScrollbarTheme.h:
(WebCore::RenderScrollbarTheme::~RenderScrollbarTheme): Deleted.
(WebCore::RenderScrollbarTheme::scrollbarThickness): Deleted.
(WebCore::RenderScrollbarTheme::buttonsPlacement): Deleted.
(WebCore::RenderScrollbarTheme::supportsControlTints): Deleted.
(WebCore::RenderScrollbarTheme::shouldCenterOnThumb): Deleted.
(WebCore::RenderScrollbarTheme::initialAutoscrollTimerDelay): Deleted.
(WebCore::RenderScrollbarTheme::autoscrollTimerDelay): Deleted.
(WebCore::RenderScrollbarTheme::registerScrollbar): Deleted.
(WebCore::RenderScrollbarTheme::unregisterScrollbar): Deleted.
* rendering/RenderSnapshottedPlugIn.h:
* rendering/RenderTextControlMultiLine.h:
* rendering/RenderTextFragment.h:
* rendering/RenderThemeGtk.h:
* rendering/RenderThemeIOS.h:
* rendering/RenderThemeWin.h:
* rendering/RenderVideo.h:
* rendering/TextAutosizer.h:
* rendering/TrailingFloatsRootInlineBox.h:
* rendering/mathml/RenderMathMLBlock.h:
* rendering/mathml/RenderMathMLMenclose.h:
* rendering/mathml/RenderMathMLOperator.h:
* rendering/mathml/RenderMathMLRadicalOperator.h:
* rendering/mathml/RenderMathMLRoot.h:
* rendering/mathml/RenderMathMLRow.h:
* rendering/mathml/RenderMathMLScripts.h:
* rendering/mathml/RenderMathMLToken.h:
* rendering/mathml/RenderMathMLUnderOver.h:
* rendering/shapes/BoxShape.h:
* rendering/shapes/PolygonShape.h:
* rendering/shapes/RasterShape.h:
* rendering/shapes/RectangleShape.h:
* rendering/style/BasicShapes.h:
* rendering/style/StylePendingImage.h:
(WebCore::StylePendingImage::computeIntrinsicDimensions): Deleted.
* rendering/svg/RenderSVGBlock.h:
* rendering/svg/RenderSVGContainer.h:
* rendering/svg/RenderSVGEllipse.h:
* rendering/svg/RenderSVGForeignObject.h:
* rendering/svg/RenderSVGImage.h:
* rendering/svg/RenderSVGPath.h:
* rendering/svg/RenderSVGRect.h:
* rendering/svg/RenderSVGResourceClipper.h:
* rendering/svg/RenderSVGResourceFilter.h:
* rendering/svg/RenderSVGResourceFilterPrimitive.h:
* rendering/svg/RenderSVGResourceLinearGradient.h:
* rendering/svg/RenderSVGResourceMarker.h:
* rendering/svg/RenderSVGResourceMasker.h:
* rendering/svg/RenderSVGResourcePattern.h:
* rendering/svg/RenderSVGResourceRadialGradient.h:
* rendering/svg/RenderSVGRoot.h:
* rendering/svg/RenderSVGTSpan.h:
* rendering/svg/RenderSVGText.h:
* rendering/svg/RenderSVGTransformableContainer.h:
* rendering/svg/RenderSVGViewportContainer.h:
* rendering/svg/SVGInlineTextBox.h:
* rendering/svg/SVGRootInlineBox.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@175084 268f45cc-cd09-0410-ab3c-d52691b4dbfc