Attribute orphaned or anonymous network usage to the Browser resources.
Attribute orphaned or anonymous network usage to the Browser resources.

BUG=47955,69883
TEST=When a tab is closed with a download in-progress and Task Manager displayed, the network activity is reflected in the Browser resource's Network total.

Review URL: http://codereview.chromium.org/6383002
Patch from James Weatherall <wez@chromium.org>.

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@72095 0039d316-1c4b-4281-b951-d872f2087c98

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