Remove unused WebMIMERegistry

sky/engine/public/platform/Platform.h

Index: sky/engine/public/platform/Platform.h
diff --git a/sky/engine/public/platform/Platform.h b/sky/engine/public/platform/Platform.h
index 03ff59a2c6fa4fba4c202a81e4b9f31971f9ce6b..514f7b9908b101de1e7333d091339089874aa508 100644
--- a/sky/engine/public/platform/Platform.h
+++ b/sky/engine/public/platform/Platform.h
@@ -62,7 +62,6 @@ class WebFlingAnimator;
 class WebGestureCurveTarget;
 class WebGestureCurve;
 class WebGraphicsContext3DProvider;
-class WebMimeRegistry;
 class WebSandboxSupport;
 struct WebFloatPoint;
 class WebThemeEngine;
@@ -84,9 +83,6 @@ public:
     // Must return non-null.
     virtual WebClipboard* clipboard() { return 0; }
 
-    // Must return non-null.
-    virtual WebMimeRegistry* mimeRegistry() { return 0; }
-
     // May return null if sandbox support is not necessary
     virtual WebSandboxSupport* sandboxSupport() { return 0; }