Expose accessible inline text boxes inside editable text controls.

BUG=328485

Review URL: https://codereview.chromium.org/104873006

git-svn-id: svn://svn.chromium.org/blink/trunk@164075 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove unused inspector fields

This patch removes two unused fields in the inspector:
InspectorDOMAgent: m_client
InspectorTimelineAgent: m_memoryAgent

No tests, no change in behavior.

Review URL: https://codereview.chromium.org/108093004

git-svn-id: svn://svn.chromium.org/blink/trunk@164076 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove WebValidationMessageClient.

Blink requested validation message requests to both of
WebValidationMessageClient and WebViewClient functions. Chromium
browser has switched to the latter and we should remove
WebValidationMessageClient.

Content Shell still calls WebView::setValidationMessageClient() in order to
use a mock implementation. We keep WebView::
setValidationMessageClient() as an empty function for now, and remove it
later.

BUG=293608

Review URL: https://codereview.chromium.org/117133003

git-svn-id: svn://svn.chromium.org/blink/trunk@164077 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove unused methods of GraphicsLayerClient

didCommitChangesForLayer() & getCurrentTransform() were apparently needed
by other platforms and are unused in blink.

Review URL: https://codereview.chromium.org/116223004

git-svn-id: svn://svn.chromium.org/blink/trunk@164078 bbb929c8-8fbe-4397-9dbb-9b2b20218538