Moved DOMActionType information from extras into a real field (ActivityLog)

Previously, the DOMActionType was being sent from the renderer to the browser ActivityLog as a string. It was then being turned into an enum. I've now moved it to its own proper field, and it's being marshaled across the renderer/browser boundary as an int that matches an enum instead of as a string.

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BUG=229703

Review URL: https://chromiumcodereview.appspot.com/15520002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203037 0039d316-1c4b-4281-b951-d872f2087c98
12 files changed