[PhysicalWeb] Add physical_web namespace.

chrome/browser/android/physical_web/physical_web_data_source_android.h

 // Copyright 2016 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 CHROME_BROWSER_ANDROID_PHYSICAL_WEB_PHYSICAL_WEB_DATA_SOURCE_ANDROID_H_
 #define CHROME_BROWSER_ANDROID_PHYSICAL_WEB_PHYSICAL_WEB_DATA_SOURCE_ANDROID_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 27 matching lines @@
   // caller. Call only once.
   std::unique_ptr<base::ListValue> GetMetadataList();
 
  private:
   std::unique_ptr<base::ListValue> metadata_list_;
   bool accessed_once_;
 
   DISALLOW_COPY_AND_ASSIGN(PhysicalWebCollection);
 };
 
-class PhysicalWebDataSourceAndroid : public PhysicalWebDataSourceImpl {
+class PhysicalWebDataSourceAndroid
+    : public physical_web::PhysicalWebDataSourceImpl {
  public:
   PhysicalWebDataSourceAndroid();
   ~PhysicalWebDataSourceAndroid() override;
 
   static bool RegisterPhysicalWebDataSource(JNIEnv* env);
 
   void Initialize();
 
   void StartDiscovery(bool network_request_enabled) override;
   void StopDiscovery() override;
@@ skipping 13 matching lines @@
                          jdouble distance_estimate);
 
  private:
   // A reference to the Java UrlManager singleton.
   base::android::ScopedJavaGlobalRef<jobject> url_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(PhysicalWebDataSourceAndroid);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_PHYSICAL_WEB_PHYSICAL_WEB_DATA_SOURCE_ANDROID_H_