Add DumpAccessibilityTree tests for modal dialogs.

This tests the Blink-side change:
https://codereview.chromium.org/70213002/

Some DumpAccessibilityTree tests crash on Android
(http://crbug.com/314376), this CL removes Android
expectations for those tests so we know to rebaseline
when the bug is fixed.

BUG=304779

Review URL: https://codereview.chromium.org/64273003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235091 0039d316-1c4b-4281-b951-d872f2087c98
SyncFS: Fix memory leaks on unit_tests

SyncFileSystemBackend posts a delete task to the IO thread, but some tests
do not wait for completion of the task and it causes memory leaks.
This change makes them wait for completion.


BUG=282646
TEST=unit_tests --gtest_filter=DeclarativeContentRulesRegistryTest.*
TEST=unit_tests --gtest_filter=DeclarativeContentActionTest.*
TEST=unit_tests --gtest_filter=SavedFilesServiceUnitTest.*

Review URL: https://codereview.chromium.org/71223003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235092 0039d316-1c4b-4281-b951-d872f2087c98
Navigating away from a windowed V1 app domain should keep the application in that domain.

BUG=312270
TEST=browsertest (&visual test)

Review URL: https://codereview.chromium.org/71733002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235093 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235092
SVN changes up to revision 235093