Cleanup ViewManager code

. get rid of most of the separate objects, which were making my head explode. There's now just ViewManagerImpl and ViewImpl. ViewManagerImpl implements NativeViewportClient, LauncherClient, ShellClient, etc.

R=sky@chromium.org
BUG=

Review URL: https://codereview.chromium.org/149363006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247758 0039d316-1c4b-4281-b951-d872f2087c98
[Sync] Don't enable synced notification app info by default

Core types don't respect off by default state yet.

TBR=petewil@chromium.org
BUG=339094, 280266

Review URL: https://codereview.chromium.org/146913004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247759 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247759