Always enable FCM on Windows.

content/public/common/content_switches.h

Index: content/public/common/content_switches.h
diff --git a/content/public/common/content_switches.h b/content/public/common/content_switches.h
index c468139f903c1b340c8a262cdc187002488778ca..8d35e47f77bf644db35b969308d8c58cc7327680 100644
--- a/content/public/common/content_switches.h
+++ b/content/public/common/content_switches.h
@@ -214,7 +214,6 @@ extern const char kShowPaintRects[];
 CONTENT_EXPORT extern const char kSimulateTouchScreenWithMouse[];
 CONTENT_EXPORT extern const char kSingleProcess[];
 CONTENT_EXPORT extern const char kSitePerProcess[];
-CONTENT_EXPORT extern const char kSkipGpuDataLoading[];
 extern const char kSpeechRecognitionWebserviceKey[];
 CONTENT_EXPORT extern const char kStatsCollectionController[];
 extern const char kTabCaptureDownscaleQuality[];
@@ -281,6 +280,10 @@ extern const char kChildCleanExit[];
 CONTENT_EXPORT extern const char kTestCompositor[];
 #endif
 
+#if defined(OS_LINUX) || defined(OS_MACOSX)
+CONTENT_EXPORT extern const char kSkipGpuDataLoading[];
+#endif
+
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).