Fix uninitialized access in QuicInMemoryCache::GetKey

BUG=329951

Review URL: https://codereview.chromium.org/113413003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242159 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242159
Add a switch for enabling the ManagePasswordsBubbleUI to the about:flags page.

BUG=261628

Review URL: https://codereview.chromium.org/118713004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242161 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242161