Revert r115276, it broke PanelDownloadTest.Download in interactive_ui_tests

Revert r115276, it broke PanelDownloadTest.Download in interactive_ui_tests
on win,linux,mac.

Original change: Rename TabContents::controller() to GetController and put it into the WebContents namespace.

BUG=98716
TBR=dpranke
Review URL: http://codereview.chromium.org/8956050

TBR=jam

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=115346

[commit-bot: I haz the power, 2011-12-21 16:56:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/thakis@chromium.org/9018016/1

[commit-bot: I haz the power, 2011-12-21 16:57:58]

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