mojo-js: Fix constant name in media router bindings

Generate constant names have recently changed to CONSTANT_CAISING. This
CL fixes usage of the old names.

Bug: 1014233
Change-Id: Ib7c7c50bcb34150c86bbeec08c7aaac87718de1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862886Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706679}

chrome/renderer/resources/extensions/media_router_bindings.js

@@ -744,8 +744,8 @@ MediaRouter.prototype.getMojoExports = function() {
     MirroringSessionObserverPtr: mirroring.mojom.SessionObserverPtr,
     MirroringSessionParameters: mirroring.mojom.SessionParameters,
     MirroringSessionType: mirroring.mojom.SessionType,
-    MirroringRemotingNamespace: mirroring.mojom.kRemotingNamespace,
-    MirroringWebRtcNamespace: mirroring.mojom.kWebRtcNamespace,
+    MirroringRemotingNamespace: mirroring.mojom.REMOTING_NAMESPACE,
+    MirroringWebRtcNamespace: mirroring.mojom.WEB_RTC_NAMESPACE,
     MirrorServiceRemoter: MirrorServiceRemoterAdapter,
     MirrorServiceRemoterPtr: MirrorServiceRemoterPtrAdapter,
     MirrorServiceRemotingSourcePtr: MirrorServiceRemotingSourcePtrAdapter,