Images don't appear when they finish loading

RenderImage needs to notify its base class unconditionally so that it will
schedule a visual update.

This broke in https://codereview.chromium.org/791023006.

R=ojan@chromium.org
BUG=https://github.com/domokit/mojo/issues/55

Review URL: https://codereview.chromium.org/969863002

engine/core/rendering/RenderImage.cpp

@@ -109,8 +109,7 @@ void RenderImage::imageChanged(WrappedImagePtr newImage, const IntRect* rect)
         return;
     }
 
-    if (hasBoxDecorationBackground())
-        RenderReplaced::imageChanged(newImage, rect);
+    RenderReplaced::imageChanged(newImage, rect);
 
     ASSERT(isRooted());