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..a291186d1d81e08ec6ce2c7926ae8d39586a7a91 100644
--- a/blimp/engine/app/blimp_content_browser_client.h
+++ b/blimp/engine/app/blimp_content_browser_client.h
@@ -30,6 +30,8 @@ class BlimpContentBrowserClient : public content::ContentBrowserClient {
                            content::WebPreferences* prefs) override;
   void RegisterRenderProcessMojoServices(
       content::ServiceRegistry* registry) override;
+  content::LocationProvider* OverrideSystemLocationProvider() override;
+  bool UseNetworkLocationProviders() override;
 
   BlimpBrowserContext* GetBrowserContext();
 
@@ -37,6 +39,8 @@ class BlimpContentBrowserClient : public content::ContentBrowserClient {
   // Owned by BrowserMainLoop
   BlimpBrowserMainParts* blimp_browser_main_parts_ = nullptr;
 
+  std::unique_ptr<BlimpLocationProvider> location_provider_;
+
   DISALLOW_COPY_AND_ASSIGN(BlimpContentBrowserClient);
 };