Remove warning DCHECK from GPU Image Decode Controller

When uploading an image, the DeferredTextureImageUsageParams should not
have changed from initial sizing time. Somehow this can happen. This is
not a correctness error, but a slight perf issue, as it will cause us
to lazy generate mips as opposed to doing so asynchronously.

We should fix this issue and re-add the DCHECKs to enforce this, but
until we are able to, remove the DCHECK.

BUG=649167
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2361493005
Cr-Commit-Position: refs/heads/master@{#420685}

cc/tiles/gpu_image_decode_controller.cc

@@ -973,12 +973,9 @@ void GpuImageDecodeController::DecodeImageIfNecessary(
         break;
       }
       case DecodedDataMode::GPU: {
-        // Params should not have changed since initial sizing.
-        DCHECK(image_data->upload_params.fMatrix == draw_image.matrix());
-        DCHECK_EQ(image_data->upload_params.fPreScaleMipLevel,
-                  CalculateUploadScaleMipLevel(draw_image));
-        DCHECK_EQ(image_data->upload_params.fQuality,
-                  CalculateUploadScaleFilterQuality(draw_image));
+        // TODO(crbug.com/649167): Params should not have changed since initial
+        // sizing. Somehow this still happens. We should investigate and re-add
+        // DCHECKs here to enforce this.
 
         if (!draw_image.image()->getDeferredTextureImageData(
                 *context_threadsafe_proxy_.get(), &image_data->upload_params, 1,