Remove support for the LEGACY_CSS_VENDOR_PREFIXES compile-time flag.

Source/WebCore/bindings/generic/RuntimeEnabledFeatures.h

Index: Source/WebCore/bindings/generic/RuntimeEnabledFeatures.h
diff --git a/Source/WebCore/bindings/generic/RuntimeEnabledFeatures.h b/Source/WebCore/bindings/generic/RuntimeEnabledFeatures.h
index b4e7775e6134f3c874497fc0eef4f836150f63ee..d59540033f6af0c44260fb968f51aafe2f723832 100644
--- a/Source/WebCore/bindings/generic/RuntimeEnabledFeatures.h
+++ b/Source/WebCore/bindings/generic/RuntimeEnabledFeatures.h
@@ -201,11 +201,6 @@ public:
     static bool webkitRTCPeerConnectionEnabled() { return peerConnectionEnabled(); }
 #endif
 
-#if ENABLE(LEGACY_CSS_VENDOR_PREFIXES)
-    static void setLegacyCSSVendorPrefixesEnabled(bool isEnabled) { isLegacyCSSVendorPrefixesEnabled = isEnabled; }
-    static bool legacyCSSVendorPrefixesEnabled() { return isLegacyCSSVendorPrefixesEnabled; }
-#endif
-
 #if ENABLE(GAMEPAD)
     static void setWebkitGetGamepadsEnabled(bool isEnabled) { isGamepadEnabled = isEnabled; }
     static bool webkitGetGamepadsEnabled() { return isGamepadEnabled; }
@@ -344,10 +339,6 @@ private:
     static bool isGamepadEnabled;
 #endif
 
-#if ENABLE(LEGACY_CSS_VENDOR_PREFIXES)
-    static bool isLegacyCSSVendorPrefixesEnabled;
-#endif
-
 #if ENABLE(QUOTA)
     static bool isQuotaEnabled;
 #endif