WebUI TaskManager: Make the button "End process" grayed on selecting the browser process.
WebUI TaskManager: Make the button "End process" grayed on selecting the browser process.

This regression is due to lack of 'type' information of task in task list data from the handler to javascript. This has been caused by http://crrev.com/119052.

BUG=115380
TEST=manual

Review URL: http://codereview.chromium.org/9535008

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@124663 0039d316-1c4b-4281-b951-d872f2087c98

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