[PhysicalWeb] Add physical_web namespace.

ios/chrome/browser/application_context.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 IOS_CHROME_BROWSER_APPLICATION_CONTEXT_H_
 #define IOS_CHROME_BROWSER_APPLICATION_CONTEXT_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 23 matching lines @@
 }
 
 namespace net_log {
 class ChromeNetLog;
 }
 
 namespace network_time {
 class NetworkTimeTracker;
 }
 
+namespace physical_web {
+class PhysicalWebDataSource;
+}
+
 namespace rappor {
 class RapporService;
 }
 
 namespace safe_browsing {
 class SafeBrowsingService;
 }
 
 namespace variations {
 class VariationsService;
 }
 
 class ApplicationContext;
 class CRLSetFetcher;
 class IOSChromeIOThread;
-class PhysicalWebDataSource;
 class PrefService;
 
 // Gets the global application context. Cannot return null.
 ApplicationContext* GetApplicationContext();
 
 class ApplicationContext {
  public:
   ApplicationContext();
   virtual ~ApplicationContext();
 
@@ skipping 49 matching lines @@
   virtual gcm::GCMDriver* GetGCMDriver() = 0;
 
   // Gets the ComponentUpdateService.
   virtual component_updater::ComponentUpdateService*
   GetComponentUpdateService() = 0;
 
   // Gets the CRLSetFetcher.
   virtual CRLSetFetcher* GetCRLSetFetcher() = 0;
 
   // Gets the PhysicalWebDataSource.
-  virtual PhysicalWebDataSource* GetPhysicalWebDataSource() = 0;
+  virtual physical_web::PhysicalWebDataSource* GetPhysicalWebDataSource() = 0;
 
  protected:
   // Sets the global ApplicationContext instance.
   static void SetApplicationContext(ApplicationContext* context);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ApplicationContext);
 };
 
 #endif  // IOS_CHROME_BROWSER_APPLICATION_CONTEXT_H_