mus: Make --use-mus-in-renderer the default for --mash.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 4546d52b7e3824a30aa9fc838f8434555224e975..d6587025ad46d104555cf56e20b57f986b1b8932 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -1788,6 +1788,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kMSEVideoBufferSizeLimit,
     switches::kNoReferrers,
     switches::kNoSandbox,
+    switches::kNoUseMusInRenderer,
     switches::kOverridePluginPowerSaverForTesting,
     switches::kPassiveListenersDefault,
     switches::kPpapiInProcess,
@@ -1876,7 +1877,6 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kIpcDumpDirectory,
     switches::kIpcFuzzerTestcase,
 #endif
-    switches::kUseMusInRenderer,
   };
   renderer_cmd->CopySwitchesFrom(browser_cmd, kSwitchNames,
                                  arraysize(kSwitchNames));