Fix use after free in SearchProviderInstallData GoogleURLObserver.

Follow-up to r246358.

BUG=338341
R=avi@chromium.org
TBR=pkasting@chromium.org

Review URL: https://codereview.chromium.org/137833009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247898 0039d316-1c4b-4281-b951-d872f2087c98
Remove attach_ as publicly exposed method of Event.

BUG=324859

Review URL: https://codereview.chromium.org/139903006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247899 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247898
SVN changes up to revision 247899
Unindented inclusion of +article fragment because it added extra whitespace to <pre> code blocks

BUG=none

Review URL: https://codereview.chromium.org/149543003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247900 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247900