Bug 929513 Part 8: Remove IPDL support for passing gfxSize r=nical

dom/ipc/PBrowser.ipdl

@@ -29,7 +29,6 @@ include "mozilla/layers/CompositorTypes.h";
 
 using IPC::Principal;
 using gfxMatrix;
-using gfxSize;
 using CSSRect;
 using mozilla::layers::FrameMetrics;
 using FrameMetrics::ViewID;

gfx/ipc/GfxMessageUtils.h

@@ -119,27 +119,6 @@ struct ParamTraits<gfxPoint3D>
   }
 };
 
-template<>
-struct ParamTraits<gfxSize>
-{
-  typedef gfxSize paramType;
-
-  static void Write(Message* aMsg, const paramType& aParam)
-  {
-    WriteParam(aMsg, aParam.width);
-    WriteParam(aMsg, aParam.height);
-  }
-
-  static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
-  {
-    if (ReadParam(aMsg, aIter, &aResult->width) &&
-        ReadParam(aMsg, aIter, &aResult->height))
-      return true;
-
-    return false;
-  }
-};
-
 template<>
 struct ParamTraits<gfxRect>
 {