Use scoped_ptr::Pass instead of scoped_ptr::PassAs<T>.

ui/ozone/platform/caca/ozone_platform_caca.cc

 // Copyright 2014 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 "ui/ozone/platform/caca/ozone_platform_caca.h"
 
 #include "ui/ozone/common/native_display_delegate_ozone.h"
 #include "ui/ozone/platform/caca/caca_event_source.h"
 #include "ui/ozone/platform/caca/caca_window.h"
 #include "ui/ozone/platform/caca/caca_window_manager.h"
@@ skipping 21 matching lines @@
   }
   virtual GpuPlatformSupportHost* GetGpuPlatformSupportHost() override {
     return NULL;  // no GPU support
   }
   virtual scoped_ptr<PlatformWindow> CreatePlatformWindow(
       PlatformWindowDelegate* delegate,
       const gfx::Rect& bounds) override {
     scoped_ptr<CacaWindow> caca_window(new CacaWindow(
         delegate, window_manager_.get(), event_source_.get(), bounds));
     if (!caca_window->Initialize())
-      return scoped_ptr<PlatformWindow>();
-    return caca_window.PassAs<PlatformWindow>();
+      return nullptr;
+    return caca_window.Pass();
   }
   virtual scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate()
       override {
     return scoped_ptr<NativeDisplayDelegate>(new NativeDisplayDelegateOzone());
   }
 
   virtual void InitializeUI() override {
     window_manager_.reset(new CacaWindowManager);
     event_source_.reset(new CacaEventSource());
     cursor_factory_ozone_.reset(new CursorFactoryOzone());
   }
 
   virtual void InitializeGPU() override {}
 
  private:
   scoped_ptr<CacaWindowManager> window_manager_;
   scoped_ptr<CacaEventSource> event_source_;
   scoped_ptr<CursorFactoryOzone> cursor_factory_ozone_;
 
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformCaca);
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformCaca() { return new OzonePlatformCaca; }
 
 }  // namespace ui