Guard usage of kEnableMediaRouter with ENABLE_MEDIA_ROUTER

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 60cafaf3f19fcad85d5daf1a2a20e86d42b8329e..887d07930eb5cd7ed438f803295ded696737d964 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1334,8 +1334,12 @@ bool MdSettingsEnabled() {
 }
 
 bool MediaRouterEnabled() {
+#if defined(ENABLE_MEDIA_ROUTER)
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
       ::switches::kEnableMediaRouter);
+#else
+  return false;
+#endif
 }
 
 // Will return true as a default value if the "disable-new-offline-error-page"