[PhysicalWeb] Add physical_web namespace.

chrome/browser/browser_process.h

Index: chrome/browser/browser_process.h
diff --git a/chrome/browser/browser_process.h b/chrome/browser/browser_process.h
index c3a2fd002d86b00b245751adcab0dd64b3a50b29..c106533af67463d7ef58752b3d17de73e8c65aef 100644
--- a/chrome/browser/browser_process.h
+++ b/chrome/browser/browser_process.h
@@ -33,7 +33,6 @@ class IOThread;
 class MediaFileSystemRegistry;
 class NotificationPlatformBridge;
 class NotificationUIManager;
-class PhysicalWebDataSource;
 class PrefRegistrySimple;
 class PrefService;
 class Profile;
@@ -98,6 +97,10 @@ namespace network_time {
 class NetworkTimeTracker;
 }
 
+namespace physical_web {
+class PhysicalWebDataSource;
+}
+
 namespace policy {
 class BrowserPolicyConnector;
 class PolicyService;
@@ -281,7 +284,7 @@ class BrowserProcess {
   CachedDefaultWebClientState() = 0;
 
   // Returns the Physical Web data source.
-  virtual PhysicalWebDataSource* GetPhysicalWebDataSource() = 0;
+  virtual physical_web::PhysicalWebDataSource* GetPhysicalWebDataSource() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserProcess);