Remove TabContents from TabStripModelObserver::TabDetachedAt.

BUG=107201
TEST=no visible change


Review URL: https://chromiumcodereview.appspot.com/11293205

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@167122 0039d316-1c4b-4281-b951-d872f2087c98
void BrowserTabStripController::TabMoved(TabContents* contents,
                                         int from_model_index,
                                         int to_model_index) {
  hover_tab_selector_.CancelTabTransition();

  TabRendererData data;
  SetTabRendererDataFromModel(contents->web_contents(), to_model_index, &data,
                              EXISTING_TAB);
  tabstrip_->MoveTab(from_model_index, to_model_index, data);
}

void BrowserTabStripController::TabMoved(TabContents* contents,
                                         int from_model_index,
                                         int to_model_index) {
  hover_tab_selector_.CancelTabTransition();

  TabRendererData data;
  SetTabRendererDataFromModel(contents->web_contents(), to_model_index, &data,
                              EXISTING_TAB);
  tabstrip_->MoveTab(from_model_index, to_model_index, data);
}
