GitLab

Reason for revert: Use-after-free heap errors caught by asan.
See bug 286483.

> Make AppShimHostManager a RefCountedThreadSafe.
> 
> This prevents a crash when Chrome shuts down immediately and 
> AppShimHostManager is destructed before InitOnFileThread is run.
> Note this means AppShimHostManager can stay around longer than
> BrowserProcessPlatformPart during initialization.
> 
> Review URL: https://chromiumcodereview.appspot.com/20065004

BUG=286483,242941
TBR=jackhou@chromium.org

Review URL: https://codereview.chromium.org/24052002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221793 0039d316-1c4b-4281-b951-d872f2087c98