[Media Router] Use DialMediaSinkService in MediaRouterMojoImpl

chrome/common/media_router/mojo/media_router.mojom

Index: chrome/common/media_router/mojo/media_router.mojom
diff --git a/chrome/common/media_router/mojo/media_router.mojom b/chrome/common/media_router/mojo/media_router.mojom
index f1c657680314510c0ed740c22ce65c529ea58093..11422a6d0ae312845ba3c1ef12f5f3be19986333 100644
--- a/chrome/common/media_router/mojo/media_router.mojom
+++ b/chrome/common/media_router/mojo/media_router.mojom
@@ -423,7 +423,7 @@ interface MediaRouter {
   // Returns a string that uniquely identifies the Media Router browser
   // process.
   RegisterMediaRouteProvider(MediaRouteProvider media_router_provider) =>
-      (string instance_id);
+      (string instance_id, bool enable_browser_side_discovery);

[mark a. foltz, 2017/04/26 23:52:56]

As I mentioned elsewhere passing a mojo struct like

MediaRouteProviderConfig {
 bool enable_dial_discovery; 
 bool enable_cast_discovery;
}

to pass flags from the browser to the provider would be more extensible.  It
would also allow the bindings to just pass the mojo config object directly into
the MRPM, instead of keeping flags.

[zhaobin, 2017/05/03 01:53:59]

Done.

 
   // Called when the Media Route Manager receives a new list of |sinks|
   // compatible with |media_source|. The result is only valid for |origins|. If