Geolocation: extract ContentBrowserClient methods specific to Geolocation into a class

content/public/browser/geolocation_provider.h

Index: content/public/browser/geolocation_provider.h
diff --git a/content/public/browser/geolocation_provider.h b/content/public/browser/geolocation_provider.h
index 0f247a1d2e8d17388814f2acd2ba4e14d1cb1270..bf484a0c814740fead567818cd849222b76b3dbf 100644
--- a/content/public/browser/geolocation_provider.h
+++ b/content/public/browser/geolocation_provider.h
@@ -11,7 +11,9 @@
 #include "content/common/content_export.h"
 
 namespace content {
+class AccessTokenStore;
 struct Geoposition;
+class LocationProvider;
 
 // This is the main API to the geolocation subsystem. The application will hold
 // a single instance of this class and can register multiple clients to be
@@ -26,6 +28,29 @@ struct Geoposition;
 // uses run on a separate Geolocation thread.
 class GeolocationProvider {
  public:
+  // An embedder of Geolocation may override these class' methods to provide
+  // specific functionality.
+  // TODO(mcasas): Extract this class into a file of its own.
+  class CONTENT_EXPORT Delegate {
+   public:
+    // Returns true if the location API should use network-based location
+    // approximation in addition to the system provider, if any.
+    virtual bool UseNetworkLocationProviders();
+
+    // Creates a new AccessTokenStore for geolocation. May return nullptr.
+    // TODO(mcasas): consider changing it return type to std::unique_ptr<> to
+    // clarify ownership, https://crbug.com/623114.
+    virtual AccessTokenStore* CreateAccessTokenStore();
+
+    // Allows an embedder to return its own LocationProvider implementation.
+    // Return nullptr to use the default one for the platform to be created.
+    // Caller takes ownership of the returned LocationProvider. FYI: Used by an
+    // external project; please don't remove. Contact Viatcheslav Ostapenko at
+    // sl.ostapenko@samsung.com for more information.
+    // TODO(mcasas): return std::unique_ptr<> instead, https://crbug.com/623132.
+    virtual LocationProvider* OverrideSystemLocationProvider();
+  };
+
   CONTENT_EXPORT static GeolocationProvider* GetInstance();
 
   typedef base::Callback<void(const Geoposition&)> LocationUpdateCallback;