Cache image data objects.

webkit/plugins/ppapi/ppb_image_data_impl.cc

Index: webkit/plugins/ppapi/ppb_image_data_impl.cc
diff --git a/webkit/plugins/ppapi/ppb_image_data_impl.cc b/webkit/plugins/ppapi/ppb_image_data_impl.cc
index c58846af0c1b4586c06d157afdc4a8a1920dae2e..7592d1b68e01be80f05e5c5b516d7dc848f85b7c 100644
--- a/webkit/plugins/ppapi/ppb_image_data_impl.cc
+++ b/webkit/plugins/ppapi/ppb_image_data_impl.cc
@@ -132,13 +132,6 @@ const SkBitmap* PPB_ImageData_Impl::GetMappedBitmap() const {
   return backend_->GetMappedBitmap();
 }
 
-void PPB_ImageData_Impl::Swap(PPB_ImageData_Impl* other) {
-  backend_.swap(other->backend_);
-  std::swap(other->format_, format_);
-  std::swap(other->width_, width_);
-  std::swap(other->height_, height_);
-}
-
 // ImageDataPlatformBackend --------------------------------------------------
 
 ImageDataPlatformBackend::ImageDataPlatformBackend() {