Add Media Router result code for user cancellation

chrome/browser/media/router/route_request_result.h

Index: chrome/browser/media/router/route_request_result.h
diff --git a/chrome/browser/media/router/route_request_result.h b/chrome/browser/media/router/route_request_result.h
index f568a864a26771264e811f04cd83cec8adc2db24..8b0deea5d4ec6956fc8ff593ddc30c431c69430c 100644
--- a/chrome/browser/media/router/route_request_result.h
+++ b/chrome/browser/media/router/route_request_result.h
@@ -34,6 +34,7 @@ class RouteRequestResult {
   // - RouteRequestResultCode in media_router.mojom
   // - MediaRouteProviderResult enum in tools/metrics/histograms.xml
   // - mr.RouteRequestResultCode in route_request_error.js
+  // - RouteRequestResultCodeFromMojo in media_router_type_converters.cc
   enum ResultCode {
     UNKNOWN_ERROR = 0,
     OK = 1,
@@ -43,9 +44,10 @@ class RouteRequestResult {
     INVALID_ORIGIN = 5,
     INCOGNITO_MISMATCH = 6,
     NO_SUPPORTED_PROVIDER = 7,
+    CANCELLED = 8,
     // New values must be added here.
 
-    TOTAL_COUNT = 8 // The total number of values.
+    TOTAL_COUNT = 9 // The total number of values.
   };
 
   static std::unique_ptr<RouteRequestResult> FromSuccess(