Refactor to make BlimpLocationProvider accessible to content layer.

blimp/engine/app/blimp_content_browser_client.h

Index: blimp/engine/app/blimp_content_browser_client.h
diff --git a/blimp/engine/app/blimp_content_browser_client.h b/blimp/engine/app/blimp_content_browser_client.h
index ab5e89578e5d1e634a3e13afc166cfe3a05ab1d5..936d1267fe775b43ec797bf0efc7df7077ba0861 100644
--- a/blimp/engine/app/blimp_content_browser_client.h
+++ b/blimp/engine/app/blimp_content_browser_client.h
@@ -6,6 +6,7 @@
 #define BLIMP_ENGINE_APP_BLIMP_CONTENT_BROWSER_CLIENT_H_
 
 #include "base/macros.h"
+#include "blimp/engine/feature/geolocation/blimp_location_provider.h"
 #include "content/public/browser/content_browser_client.h"
 
 namespace blimp {
@@ -33,10 +34,14 @@ class BlimpContentBrowserClient : public content::ContentBrowserClient {
 
   BlimpBrowserContext* GetBrowserContext();
 
+  content::LocationProvider* SoleLocationProvider() override;
+
  private:
   // Owned by BrowserMainLoop
   BlimpBrowserMainParts* blimp_browser_main_parts_ = nullptr;
 
+  BlimpLocationProvider location_provider_;
+
   DISALLOW_COPY_AND_ASSIGN(BlimpContentBrowserClient);
 };