Revert 250823 "With --site-per-process, avoid a crash when a sub..."

Speculative revert to see if the navigation changes here are causing
sync_integration_tests to fail on:

http://build.chromium.org/p/chromium.win/builders/Win7%20Sync%20x64/builds/11217

> With --site-per-process, avoid a crash when a subframe process goes away.
> 
> We need to clear out the children of any nodes that are affected by the
> crash, not the entire FrameTree.
> 
> BUG=338508
> TEST=Killing an iframe process with --site-per-process shows a green rectangle.
> R=ajwong@chromium.org, nasko@chromium.org
> 
> Review URL: https://codereview.chromium.org/156303004

TBR=creis@chromium.org

Review URL: https://codereview.chromium.org/163703004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251090 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251090
[android_webview] Fix the AOSP bot manifest.

This incorporates a neccessary fix.

BUG=None
TEST=None
TBR=torne@chromium.org

Review URL: https://codereview.chromium.org/164243002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251091 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251091