Fix ChannelMultiplexer to properly handle base channel creation failure.
ChannelMultiplexer may be destroyed from channel connection callback when it fails to connect the base channel. Previously it didn't handle this case properly. BUG=152039 Review URL: https://chromiumcodereview.appspot.com/10981009 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@158740 0039d316-1c4b-4281-b951-d872f2087c98
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