Fix Windows build warning LNK4217 for blink_platform.dll.

third_party/WebKit/Source/platform/mojo/GeometryStructTraits.h

Index: third_party/WebKit/Source/platform/mojo/GeometryStructTraits.h
diff --git a/third_party/WebKit/Source/platform/mojo/GeometryStructTraits.h b/third_party/WebKit/Source/platform/mojo/GeometryStructTraits.h
index 42afd6604329b13a79a26d14450246c672bb102a..b88c3b20a0e7337c6ae8b10585bb19786cfa653a 100644
--- a/third_party/WebKit/Source/platform/mojo/GeometryStructTraits.h
+++ b/third_party/WebKit/Source/platform/mojo/GeometryStructTraits.h
@@ -5,17 +5,16 @@
 #ifndef GeometryStructTraits_h
 #define GeometryStructTraits_h
 
-#include "platform/PlatformExport.h"
-#include "ui/gfx/geometry/mojo/geometry.mojom-blink.h"
+#include "third_party/WebKit/public/platform/WebSize.h"
+#include "ui/gfx/geometry/mojo/geometry.mojom-shared.h"
 
 namespace mojo {
 
 template <>
-struct PLATFORM_EXPORT
-    StructTraits<gfx::mojom::blink::Size::DataView, ::blink::WebSize> {
+struct StructTraits<gfx::mojom::SizeDataView, ::blink::WebSize> {
   static int width(const ::blink::WebSize& size) { return size.width; }
   static int height(const ::blink::WebSize& size) { return size.height; }
-  static bool Read(gfx::mojom::blink::Size::DataView, ::blink::WebSize* out);
+  static bool Read(gfx::mojom::SizeDataView, ::blink::WebSize* out);
 };
 
 }  // namespace mojo