Revert of SkThreadPool ~~> SkTaskGroup

tools/iOSShell.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "iOSShell.h"
 
 #include "Resources.h"
 #include "SkApplication.h"
 #include "SkCanvas.h"
 #include "SkCommonFlags.h"
 #include "SkGraphics.h"
+#include "SkThreadPool.h"
 #include "SkWindow.h"
 #include "sk_tool_utils.h"
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* curr_view(SkWindow* wind) {
     SkView::F2BIter iter(wind);
     return iter.next();
 }
 
@@ skipping 67 matching lines @@
     SkGraphics::Init();
     SkEvent::Init();
 }
 
 // FIXME: this should be in a header
 void application_term();
 void application_term() {
     SkEvent::Term();
     SkGraphics::Term();
 }