Revert 111695 - Have content/ create and destroy its own threads.

content/shell/shell_browser_main.h

Index: content/shell/shell_browser_main.h
===================================================================
--- content/shell/shell_browser_main.h	(revision 111697)
+++ content/shell/shell_browser_main.h	(working copy)
@@ -35,25 +35,28 @@
   virtual void PreMainMessageLoopStart() OVERRIDE {}
   virtual void ToolkitInitialized() OVERRIDE {}
   virtual void PostMainMessageLoopStart() OVERRIDE {}
-  virtual void PreCreateThreads() OVERRIDE;
-  virtual void PreStartThread(BrowserThread::ID id) OVERRIDE {}
-  virtual void PostStartThread(BrowserThread::ID id) OVERRIDE {}
-  virtual void PreMainMessageLoopRun() OVERRIDE {}
+  virtual void PreMainMessageLoopRun() OVERRIDE;
   virtual bool MainMessageLoopRun(int* result_code) OVERRIDE;
-  virtual void PostMainMessageLoopRun() OVERRIDE;
-  virtual void PreStopThread(BrowserThread::ID id) OVERRIDE;
-  virtual void PostStopThread(BrowserThread::ID) OVERRIDE {}
-  virtual void PostDestroyThreads() OVERRIDE {}
+  virtual void PostMainMessageLoopRun() OVERRIDE {}
 
   ResourceDispatcherHost* GetResourceDispatcherHost();
   ui::Clipboard* GetClipboard();
 
+  base::Thread* io_thread() { return io_thread_.get(); }
+  base::Thread* file_thread() { return file_thread_.get(); }
+
  private:
   scoped_ptr<ShellBrowserContext> browser_context_;
 
   scoped_ptr<ResourceDispatcherHost> resource_dispatcher_host_;
   scoped_ptr<ui::Clipboard> clipboard_;
 
+  scoped_ptr<base::Thread> io_thread_;
+  scoped_ptr<base::Thread> file_thread_;
+  scoped_ptr<base::Thread> db_thread_;
+  scoped_ptr<base::Thread> process_launcher_thread_;
+  scoped_ptr<base::Thread> cache_thread_;
+
   DISALLOW_COPY_AND_ASSIGN(ShellBrowserMainParts);
 };