[content shell] don't leak the devtools delegate

content/shell/shell_browser_main_parts.h

Index: content/shell/shell_browser_main_parts.h
diff --git a/content/shell/shell_browser_main_parts.h b/content/shell/shell_browser_main_parts.h
index 334ee03d177da277e9a7593bbed45a7c241746e2..ab8dbce0ceb4fe3bd27435288809ee54c41387eb 100644
--- a/content/shell/shell_browser_main_parts.h
+++ b/content/shell/shell_browser_main_parts.h
@@ -33,7 +33,9 @@ class ShellBrowserMainParts : public BrowserMainParts {
   virtual bool MainMessageLoopRun(int* result_code) OVERRIDE;
   virtual void PostMainMessageLoopRun() OVERRIDE;
 
-  ShellDevToolsDelegate* devtools_delegate() { return devtools_delegate_; }
+  ShellDevToolsDelegate* devtools_delegate() {
+    return devtools_delegate_.get();
+  }
 
   ShellBrowserContext* browser_context() { return browser_context_.get(); }
   ShellBrowserContext* off_the_record_browser_context() {
@@ -48,7 +50,7 @@ class ShellBrowserMainParts : public BrowserMainParts {
   const MainFunctionParams& parameters_;
   bool run_message_loop_;
 
-  ShellDevToolsDelegate* devtools_delegate_;
+  scoped_ptr<ShellDevToolsDelegate> devtools_delegate_;
 #if defined(ENABLE_PLUGINS)
   scoped_ptr<ShellPluginServiceFilter> plugin_service_filter_;
 #endif