Revert of Change WokerThread to use a blink::WebThread.

Source/platform/scheduler/SchedulerTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/scheduler/Scheduler.h"
 
 #include "platform/TestingPlatformSupport.h"
 #include "platform/TraceLocation.h"
 #include "public/platform/Platform.h"
@@ skipping 25 matching lines @@
 
     virtual void enterRunLoop() OVERRIDE
     {
         ASSERT_NOT_REACHED();
     }
 
     virtual void exitRunLoop() OVERRIDE
     {
         ASSERT_NOT_REACHED();
     }
-
-    virtual void setSharedTimerFiredFunction(SharedTimerFunction timerFunction) OVERRIDE
-    {
-        ASSERT_NOT_REACHED();
-    }
-
-    virtual void setSharedTimerFireInterval(double interval) OVERRIDE
-    {
-        ASSERT_NOT_REACHED();
-    }
-
-    virtual void stopSharedTimer() OVERRIDE
-    {
-        ASSERT_NOT_REACHED();
-    }
 
     void runPendingTasks()
     {
         while (!m_pendingTasks.isEmpty())
             m_pendingTasks.takeFirst()->run();
     }
 
 private:
     WTF::Deque<OwnPtr<Task> > m_pendingTasks;
 };
@@ skipping 147 matching lines @@
     int result = 0;
     m_scheduler->postIdleTask(bind<double>(&idleTestTask, 1, &result));
     m_scheduler->postIdleTask(bind<double>(&idleTestTask, 1, &result));
     m_scheduler->postIdleTask(bind<double>(&idleTestTask, 1, &result));
     m_scheduler->postIdleTask(bind<double>(&idleTestTask, 1, &result));
     runPendingTasks();
     EXPECT_EQ(4, result);
 }
 
 } // namespace