Revert 253735 "Always broadcast one last "tab not blocked" notif..."

> Always broadcast one last "tab not blocked" notification before closing a tab.
> 
> BUG=336386
> TEST=as in bug
> 
> Review URL: https://codereview.chromium.org/132103005

TBR=avi@chromium.org

Review URL: https://codereview.chromium.org/192913002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255952 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/tabs/tab_strip_model.cc

@@ -1250,12 +1250,6 @@ bool TabStripModel::InternalCloseTabs(const std::vector<int>& indices,
 void TabStripModel::InternalCloseTab(WebContents* contents,
                                      int index,
                                      bool create_historical_tabs) {
-  // Reset the blocked state of the tab, and fire a notification if necessary.
-  // <http://crbug.com/336386#c4> . TODO(avi): Remove all the "blocked" code and
-  // the WebContentsModalDialogManager from TabStripModel, and move all that
-  // tracking code to the modal dialog code, where it belongs.
-  SetTabBlocked(index, false);
-
   FOR_EACH_OBSERVER(TabStripModelObserver, observers_,
                     TabClosingAt(this, contents, index));