AutoFill: Release the cached frame when we receive the frameDestroyed() message
from WebKit.

BUG=48857
TEST=none

Review URL: http://codereview.chromium.org/3173005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55789 0039d316-1c4b-4281-b951-d872f2087c98
void RenderView::startDragging(const WebDragData& data,
                               WebDragOperationsMask mask,
                               const WebImage& image,
                               const WebPoint& imageOffset) {
#if WEBKIT_USING_SKIA
  SkBitmap bitmap(image.getSkBitmap());
#elif WEBKIT_USING_CG
  SkBitmap bitmap = gfx::CGImageToSkBitmap(image.getCGImageRef());
#endif

  Send(new ViewHostMsg_StartDragging(routing_id_,
                                     WebDropData(data),
                                     mask,
                                     bitmap,
                                     imageOffset));
}

void RenderView::startDragging(const WebDragData& data,
                               WebDragOperationsMask mask,
                               const WebImage& image,
                               const WebPoint& imageOffset) {
#if WEBKIT_USING_SKIA
  SkBitmap bitmap(image.getSkBitmap());
#elif WEBKIT_USING_CG
  SkBitmap bitmap = gfx::CGImageToSkBitmap(image.getCGImageRef());
#endif

  Send(new ViewHostMsg_StartDragging(routing_id_,
                                     WebDropData(data),
                                     mask,
                                     bitmap,
                                     imageOffset));
}
