Don't handle DispatchOnInspectorBackend msg for SharedWorkers in DevToolsAgentFilter.

DevToolsAgentMsg_DispatchOnInspectorBackend message for SharedWorkers must be handled in SharedWorkerDevToolsAgent.

BUG=327256

Review URL: https://codereview.chromium.org/198753002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@258237 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed