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 8f50dfc86a4f8a0855402d2b18040ea78d7d0703..9f4ce84bd9a2e241870a36243712be7309804b27 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 {
@@ -32,12 +33,17 @@ class BlimpContentBrowserClient : public content::ContentBrowserClient {
       content::ServiceRegistry* registry,
       content::RenderProcessHost* render_process_host) override;
 
+  content::LocationProvider* OverrideSystemLocationProvider() override;
+  bool UseNetworkLocationProviders() override;
+
   BlimpBrowserContext* GetBrowserContext();
 
  private:
   // Owned by BrowserMainLoop
   BlimpBrowserMainParts* blimp_browser_main_parts_ = nullptr;
 
+  std::unique_ptr<BlimpLocationProvider> location_provider_;
+
   DISALLOW_COPY_AND_ASSIGN(BlimpContentBrowserClient);
 };