Remove nonexistent StringPairVector.h from Target.pri after r142839

Unreviewed gardening.

* Target.pri:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144066 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Draw intermediate snapshots if possible
https://bugs.webkit.org/show_bug.cgi?id=110811

Reviewed by Simon Fraser.

After http://webkit.org/b/110495 we delayed snapshotting until we've
received a nice image, but this made the page look like it is broken.
We should draw any intermediate snapshots that we find, which might
include content such as progress bars/spinners.

Source/WebCore:

* html/HTMLPlugInElement.h:
(WebCore::HTMLPlugInElement::isPlugInImageElement): Expose virtual method
to indicate if this is a HTMLPlugInImageElement or not.
* html/HTMLPlugInImageElement.cpp:
(WebCore::HTMLPlugInImageElement::updateSnapshot): If we have
a RenderEmbeddedObject renderer, then tell it to repaint.
* html/HTMLPlugInImageElement.h:
(WebCore::HTMLPlugInImageElement::snapshotImage): Expose an
accessor for snapshot images.
* rendering/RenderEmbeddedObject.cpp:
(WebCore::RenderEmbeddedObject::paintSnapshotImage): New helper
method to render an image directly. This code is similar to
that in RenderSnapshottedPlugIn.
(WebCore::RenderEmbeddedObject::paintContents): The virtual implementation
of this method for use when we have a snapshot to paint. If we are a plugin that is
in the process of being snapshotted, ask our HTMLPlugInImageElement for a
snapshot and paint that instead. In the case where we are not snapshotting,
or we do not yet have a snapshot, this will call back into the RenderWidget code.
* rendering/RenderEmbeddedObject.h:
(RenderEmbeddedObject): New methods paintSnapshotImage and paintContents
* rendering/RenderWidget.cpp:
(WebCore::RenderWidget::paintContents): New method called in the middle
of paint() that can be overridden by RenderEmbeddedObject. The code here was
simply moved out of the previous paint().
(WebCore::RenderWidget::paint): Call paintContents at the appropriate time.
* rendering/RenderWidget.h:
(RenderWidget): New virtual method paintContents.

Source/WebKit2:

* WebProcess/Plugins/PluginView.cpp:
(WebKit): Reinstate 60 attempts at snapshots before giving up.
(WebKit::PluginView::isAcceleratedCompositingEnabled): We do not
want accelerated compositing enabled when we are trying to capture
snapshots.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144067 268f45cc-cd09-0410-ab3c-d52691b4dbfc