Fix namespace for src/ui/display/.

ui/ozone/platform/headless/ozone_platform_headless.cc

 // Copyright 2013 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/headless/ozone_platform_headless.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 54 matching lines @@
   }
   std::unique_ptr<SystemInputInjector> CreateSystemInputInjector() override {
     return nullptr;  // no input injection support.
   }
   std::unique_ptr<PlatformWindow> CreatePlatformWindow(
       PlatformWindowDelegate* delegate,
       const gfx::Rect& bounds) override {
     return base::WrapUnique<PlatformWindow>(
         new HeadlessWindow(delegate, window_manager_.get(), bounds));
   }
-  std::unique_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate()
+  std::unique_ptr<display::NativeDisplayDelegate> CreateNativeDisplayDelegate()
       override {
     return base::MakeUnique<display::FakeDisplayDelegate>();
   }
 
   void InitializeUI() override {
     window_manager_.reset(new HeadlessWindowManager(file_path_));
     window_manager_->Initialize();
     surface_factory_.reset(new HeadlessSurfaceFactory(window_manager_.get()));
     // This unbreaks tests that create their own.
     if (!PlatformEventSource::GetInstance())
@@ skipping 29 matching lines @@
 
 OzonePlatform* CreateOzonePlatformHeadless() {
   base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
   base::FilePath location;
   if (cmd->HasSwitch(switches::kOzoneDumpFile))
     location = cmd->GetSwitchValuePath(switches::kOzoneDumpFile);
   return new OzonePlatformHeadless(location);
 }
 
 }  // namespace ui