rootRenderer in FrameView is really RenderView
https://bugs.webkit.org/show_bug.cgi?id=109510

Reviewed by Eric Seidel.

The global function rootRenderer(FrameView*) is really just a way
to get the RenderView from the Frame so replace it with a renderView()
method and replace usage of the word "root" with renderView so it's
obvious the root we're talking about is the renderView. This is an
important distinction to make since we also have rootRenderer in the code
for the documentElement()'s renderer and we also have a "layout root" which
is entirely different.

No new tests, just refactoring.

* page/FrameView.cpp:
(WebCore::FrameView::rootRenderer): Removed.
(WebCore::FrameView::setFrameRect):
(WebCore::FrameView::adjustViewSize):
(WebCore::FrameView::updateCompositingLayersAfterStyleChange):
(WebCore::FrameView::updateCompositingLayersAfterLayout):
(WebCore::FrameView::clearBackingStores):
(WebCore::FrameView::restoreBackingStores):
(WebCore::FrameView::usesCompositedScrolling):
(WebCore::FrameView::layerForHorizontalScrollbar):
(WebCore::FrameView::layerForVerticalScrollbar):
(WebCore::FrameView::layerForScrollCorner):
(WebCore::FrameView::tiledBacking):
(WebCore::FrameView::scrollLayerID):
(WebCore::FrameView::layerForOverhangAreas):
(WebCore::FrameView::flushCompositingStateForThisFrame):
(WebCore::FrameView::hasCompositedContent):
(WebCore::FrameView::enterCompositingMode):
(WebCore::FrameView::isSoftwareRenderable):
(WebCore::FrameView::didMoveOnscreen):
(WebCore::FrameView::willMoveOffscreen):
(WebCore::FrameView::layout):
(WebCore::FrameView::embeddedContentBox):
(WebCore::FrameView::contentsInCompositedLayer):
(WebCore::FrameView::scrollContentsFastPath):
(WebCore::FrameView::scrollContentsSlowPath):
(WebCore::FrameView::maintainScrollPositionAtAnchor):
(WebCore::FrameView::scrollPositionChanged):
(WebCore::FrameView::repaintFixedElementsAfterScrolling):
(WebCore::FrameView::updateFixedElementsAfterScrolling):
(WebCore::FrameView::visibleContentsResized):
(WebCore::FrameView::scheduleRelayoutOfSubtree):
(WebCore::FrameView::needsLayout):
(WebCore::FrameView::setNeedsLayout):
(WebCore::FrameView::performPostLayoutTasks):
(WebCore::FrameView::updateControlTints):
(WebCore::FrameView::paintContents):
(WebCore::FrameView::forceLayoutForPagination):
(WebCore::FrameView::adjustPageHeightDeprecated):
(WebCore::FrameView::resetTrackedRepaints):
(WebCore::FrameView::isVerticalDocument):
(WebCore::FrameView::isFlippedDocument):
* page/FrameView.h:
(WebCore::FrameView::renderView): Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142647 268f45cc-cd09-0410-ab3c-d52691b4dbfc