Clean up the receivers in VideoSourceHandler dtor in case the caller of VideoSourceHandler didn't do so.

BUG=323158
R=bbudge@chromium.org, perkj@chromium.org, wjia@chromium.org

Review URL: https://codereview.chromium.org/145353002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246715 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246715
Don't return bookmark results if an empty or space-only query is specified

Fixes a regression introduced with r241203.

BUG=335473

Review URL: https://codereview.chromium.org/141583009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246716 0039d316-1c4b-4281-b951-d872f2087c98
Check return value in PluginObserver::OnBlockedOutdatedPlugin().

This hits a segv under the IPC fuzzer, and is easy to handle. Fixing
this allows the fuzzer to progress further.

BUG=337552

Review URL: https://codereview.chromium.org/145993002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246717 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246717