Reland 155094 (reverted by 155241) - Allow PluginChannelHost::Init() to fail without crashing.
[TPM was suspicious of a Windows crash increase on renderer, but this didn't seem related.]
r152730 (Retry channel setup for NPAPI plugins) allows
NPChannelBase::Init() to fail instead of crashing when the named
socket is not found in the cache. PluginChannelHost::Init() assumed
the superclass Init() was always successful.
BUG=97285,141055
Review URL: https://chromiumcodereview.appspot.com/
10919109
TBR=shess@chromium.org
Review URL: https://chromiumcodereview.appspot.com/
10915129
TBR=shess@chromium.org
Review URL: https://chromiumcodereview.appspot.com/
10910137
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@155428 0039d316-1c4b-4281-b951-d872f2087c98