[PhysicalWeb] Add physical_web namespace.

chrome/browser/browser_process_impl.h

Index: chrome/browser/browser_process_impl.h
diff --git a/chrome/browser/browser_process_impl.h b/chrome/browser/browser_process_impl.h
index 7033736182c47a5f4ddf65083893c8cc1cbf7753..81c45e514bb31f253d1a3a4694c0bc5212ab26b7 100644
--- a/chrome/browser/browser_process_impl.h
+++ b/chrome/browser/browser_process_impl.h
@@ -156,7 +156,7 @@ class BrowserProcessImpl : public BrowserProcess,
   memory::TabManager* GetTabManager() override;
   shell_integration::DefaultWebClientState CachedDefaultWebClientState()
       override;
-  PhysicalWebDataSource* GetPhysicalWebDataSource() override;
+  physical_web::PhysicalWebDataSource* GetPhysicalWebDataSource() override;
 
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
@@ -349,7 +349,8 @@ class BrowserProcessImpl : public BrowserProcess,
 
   shell_integration::DefaultWebClientState cached_default_web_client_state_;
 
-  std::unique_ptr<PhysicalWebDataSource> physical_web_data_source_;
+  std::unique_ptr<physical_web::PhysicalWebDataSource>
+      physical_web_data_source_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessImpl);
 };