Revert of Add WorkerThread based methods for start/stop of worker threads.

content/child/webthread_impl.h

Index: content/child/webthread_impl.h
diff --git a/content/child/webthread_impl.h b/content/child/webthread_impl.h
index 476445284c8938972c4e1fc0558262737a8abb1f..4c81b2579d6806fc2f2d601682ed2446a095a056 100644
--- a/content/child/webthread_impl.h
+++ b/content/child/webthread_impl.h
@@ -9,7 +9,6 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread.h"
-#include "base/timer/timer.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebThread.h"
 
@@ -23,11 +22,6 @@
   virtual void removeTaskObserver(TaskObserver* observer);
 
   virtual bool isCurrentThread() const = 0;
-
-  typedef void (*SharedTimerFunction)();
-  virtual void setSharedTimerFiredFunction(SharedTimerFunction timerFunction) {}
-  virtual void setSharedTimerFireInterval(double) {}
-  virtual void stopSharedTimer() {}
 
  protected:
   WebThreadBase();
@@ -54,19 +48,7 @@
 
   virtual bool isCurrentThread() const OVERRIDE;
 
-  virtual void setSharedTimerFiredFunction(
-      SharedTimerFunction timerFunction) OVERRIDE;
-  virtual void setSharedTimerFireInterval(double interval_seconds) OVERRIDE;
-  virtual void stopSharedTimer() OVERRIDE;
-
  private:
-  void OnTimeout() {
-    if (shared_timer_function_)
-      shared_timer_function_();
-  }
-  base::OneShotTimer<WebThreadImpl> shared_timer_;
-  SharedTimerFunction shared_timer_function_;
-
   scoped_ptr<base::Thread> thread_;
 };