[content shell] don't leak the devtools delegate

content/shell/shell_browser_main_parts.cc

 // Copyright (c) 2012 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 "content/shell/shell_browser_main_parts.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/message_loop.h"
@@ skipping 104 matching lines @@
 #endif
 }
 
 void ShellBrowserMainParts::PreMainMessageLoopRun() {
   browser_context_.reset(new ShellBrowserContext(false));
   off_the_record_browser_context_.reset(new ShellBrowserContext(true));
 
   Shell::Initialize();
   net::NetModule::SetResourceProvider(PlatformResourceProvider);
 
-  devtools_delegate_ = new ShellDevToolsDelegate(browser_context_.get());
+  devtools_delegate_.reset(new ShellDevToolsDelegate(browser_context_.get()));
 
   if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kDumpRenderTree)) {
     Shell::CreateNewWindow(browser_context_.get(),
                            GetStartupURL(),
                            NULL,
                            MSG_ROUTING_NONE,
                            gfx::Size());
   }
 
 #if defined(ENABLE_PLUGINS)
@@ skipping 19 matching lines @@
 #if defined(USE_AURA)
   Shell::PlatformExit();
 #endif
   if (devtools_delegate_)
     devtools_delegate_->Stop();
   browser_context_.reset();
   off_the_record_browser_context_.reset();
 }
 
 }  // namespace