Remove calls to deprecated MessageLoop methods in content.

content/ppapi_plugin/ppapi_plugin_main.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 "base/base_paths.h"
 #include "base/command_line.h"
 #include "base/debug/crash_logging.h"
 #include "base/debug/debugger.h"
 #include "base/files/file_path.h"
 #include "base/i18n/rtl.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
+#include "base/run_loop.h"
 #include "base/threading/platform_thread.h"
 #include "build/build_config.h"
 #include "content/child/child_process.h"
 #include "content/common/content_constants_internal.h"
 #include "content/common/sandbox_linux/sandbox_linux.h"
 #include "content/ppapi_plugin/ppapi_thread.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
 #include "ipc/ipc_sender.h"
@@ skipping 112 matching lines @@
   blink::WebFontRendering::setDeviceScaleFactor(display::win::GetDPIScale());
 
   const gfx::FontRenderParams font_params =
       gfx::GetFontRenderParams(gfx::FontRenderParamsQuery(), nullptr);
   blink::WebFontRendering::setAntialiasedTextEnabled(font_params.antialiasing);
   blink::WebFontRendering::setLCDTextEnabled(
       font_params.subpixel_rendering !=
       gfx::FontRenderParams::SUBPIXEL_RENDERING_NONE);
 #endif
 
-  main_message_loop.Run();
+  base::RunLoop().Run();
 
 #if defined(OS_WIN)
   UninitializeDWriteFontProxy();
 #endif
   return 0;
 }
 
 }  // namespace content