Description: Make chrome-cast on by default.

--- a/extensions/common/feature_switch.cc
+++ b/extensions/common/feature_switch.cc
@@ -34,11 +34,7 @@ class CommonSwitches {
 #else
             nullptr,
 #endif
-#if defined(OS_WIN)
             FeatureSwitch::DEFAULT_ENABLED),
-#else
-            FeatureSwitch::DEFAULT_DISABLED),
-#endif
         error_console(switches::kErrorConsole, FeatureSwitch::DEFAULT_DISABLED),
         enable_override_bookmarks_ui(switches::kEnableOverrideBookmarksUI,
                                      FeatureSwitch::DEFAULT_DISABLED),
