base: Remove the string logging from CHECK().

cc/tiles/image_controller.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/tiles/image_controller.h"
 
 namespace cc {
 
 ImageController::ImageController() = default;
 ImageController::~ImageController() = default;
@@ skipping 27 matching lines @@
 
     if (need_to_unref_when_finished)
       ++it;
     else
       it = images->erase(it);
   }
 }
 
 void ImageController::UnrefImages(const std::vector<DrawImage>& images) {
   // Debugging information for crbug.com/650234.
-  CHECK(cache_) << num_times_cache_was_set_;
+  CHECK(cache_);
   for (auto image : images)
     cache_->UnrefImage(image);
 }
 
 void ImageController::ReduceMemoryUsage() {
   DCHECK(cache_);
   cache_->ReduceCacheUsage();
 }
 
 std::vector<scoped_refptr<TileTask>> ImageController::SetPredecodeImages(
     std::vector<DrawImage> images,
     const ImageDecodeCache::TracingInfo& tracing_info) {
   std::vector<scoped_refptr<TileTask>> new_tasks;
   GetTasksForImagesAndRef(&images, &new_tasks, tracing_info);
   UnrefImages(predecode_locked_images_);
   predecode_locked_images_ = std::move(images);
   return new_tasks;
 }
 
 }  // namespace cc