Fix namespace for src/ui/display/.

ui/ozone/common/display_snapshot_proxy.h

 // 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.
 
 #ifndef UI_OZONE_COMMON_DISPLAY_SNAPSHOT_PROXY_H_
 #define UI_OZONE_COMMON_DISPLAY_SNAPSHOT_PROXY_H_
 
 #include "base/macros.h"
 #include "ui/display/types/display_snapshot.h"
 
 namespace ui {
 
 struct DisplaySnapshot_Params;
 
-class DisplaySnapshotProxy : public DisplaySnapshot {
+class DisplaySnapshotProxy : public display::DisplaySnapshot {
  public:
   DisplaySnapshotProxy(const DisplaySnapshot_Params& params);
   ~DisplaySnapshotProxy() override;
 
-  // DisplaySnapshot override:
+  // display::DisplaySnapshot override:
   std::string ToString() const override;
 
  private:
   std::string string_representation_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplaySnapshotProxy);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_COMMON_DISPLAY_SNAPSHOT_PROXY_H_