cc: Remove separate x/y raster scales.

cc/output/software_renderer.cc

Index: cc/output/software_renderer.cc
diff --git a/cc/output/software_renderer.cc b/cc/output/software_renderer.cc
index 57d4a057aa198731f06b6bc60c793db4f3bfbb7d..61f07a9a2c768858147c4f52caf664a3d2266cdb 100644
--- a/cc/output/software_renderer.cc
+++ b/cc/output/software_renderer.cc
@@ -357,13 +357,11 @@ void SoftwareRenderer::DrawPictureQuad(const DrawingFrame* frame,
                                               disable_image_filtering);
     quad->raster_source->PlaybackToCanvas(
         &filtered_canvas, quad->content_rect, quad->content_rect,
-        gfx::SizeF(quad->contents_scale, quad->contents_scale),
-        playback_settings);
+        quad->contents_scale, playback_settings);
   } else {
     quad->raster_source->PlaybackToCanvas(
         current_canvas_, quad->content_rect, quad->content_rect,
-        gfx::SizeF(quad->contents_scale, quad->contents_scale),
-        playback_settings);
+        quad->contents_scale, playback_settings);
   }
 }