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::AddTab(WebContents* contents,
                                       int index,
                                       bool is_active) {
  hover_tab_selector_.CancelTabTransition();

  TabRendererData data;
  SetTabRendererDataFromModel(contents, index, &data, NEW_TAB);
  tabstrip_->AddTabAt(index, data, is_active);
}

void BrowserTabStripController::AddTab(WebContents* contents,
                                       int index,
                                       bool is_active) {
  hover_tab_selector_.CancelTabTransition();

  TabRendererData data;
  SetTabRendererDataFromModel(contents, index, &data, NEW_TAB);
  tabstrip_->AddTabAt(index, data, is_active);
}
