Fix crash in Canvas2DLayerBridge after a GPU resource is lost

BUG=411864
TEST=blink unit test Canvas2DLayerBridgeTest.testPrepareMailboxAndLoseResource

Review URL: https://codereview.chromium.org/552423002

git-svn-id: svn://svn.chromium.org/blink/trunk@181679 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove some CSS properties from UseCounters

All of these measure stable features except CSSPropertyWebkitCursorVisibility which
is actually removed.

Review URL: https://codereview.chromium.org/558473002

git-svn-id: svn://svn.chromium.org/blink/trunk@181680 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add figcaption case at 'computeAccessibilityIsIgnored()'
to keep figcation infomation on accessibility tree.

BUG=None

Review URL: https://codereview.chromium.org/553033002

git-svn-id: svn://svn.chromium.org/blink/trunk@181681 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove unneeded constructor for CompositionUnderline

Removed an unused CompositionUnderline constructor.

Review URL: https://codereview.chromium.org/550943002

git-svn-id: svn://svn.chromium.org/blink/trunk@181682 bbb929c8-8fbe-4397-9dbb-9b2b20218538