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This refactoring continues the division of the behaviour of ProcessSingleton into two parts:
* The protocol for establishing a server process and communicating between the client and server.
* How the server processes command-line invocations.

Very small behavioural change:
* If an error occurs while parsing the command-line received via COPY_DATA, the modal dialog (if any) is no longer flashed and raised to foreground.

The motivation for this change is that I wish to introduce some more sophisticated behaviour when queuing messages during startup. See the follow-up CL (in-progress) at https://codereview.chromium.org/12674028/ .

BUG=170726,170734,225693

Review URL: https://chromiumcodereview.appspot.com/12096114

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195264 0039d316-1c4b-4281-b951-d872f2087c98