Remove unused Mac platform code.

Source/platform/mac/ColorMac.h

Index: Source/platform/mac/ColorMac.h
diff --git a/Source/platform/mac/ColorMac.h b/Source/platform/mac/ColorMac.h
index 3836a3882950a8d52cb722fb8a6060f98fd855e5..c9fe0df5bc61c8f77a35504c4b27a1ed84e53be5 100644
--- a/Source/platform/mac/ColorMac.h
+++ b/Source/platform/mac/ColorMac.h
@@ -35,15 +35,8 @@ OBJC_CLASS NSColor;
 
 namespace WebCore {
 
-    // These functions assume NSColors are in DeviceRGB colorspace
-    Color PLATFORM_EXPORT colorFromNSColor(NSColor *);
-    NSColor* PLATFORM_EXPORT nsColor(const Color&);
-
-    bool PLATFORM_EXPORT usesTestModeFocusRingColor();
-    void PLATFORM_EXPORT setUsesTestModeFocusRingColor(bool);
-
-    // Focus ring color used for testing purposes.
-    RGBA32 PLATFORM_EXPORT oldAquaFocusRingColor();
+// This function assumes NSColors are in DeviceRGB colorspace
+PLATFORM_EXPORT NSColor* nsColor(const Color&);
 
 }