base: Remove the string logging from CHECK().

cc/test/layer_tree_test.cc

 // Copyright 2011 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/test/layer_tree_test.h"
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
@@ skipping 181 matching lines @@
     LayerTreeHostImpl::NotifyReadyToDraw();
     test_hooks_->NotifyReadyToDrawOnThread(this);
   }
 
   void NotifyAllTileTasksCompleted() override {
     LayerTreeHostImpl::NotifyAllTileTasksCompleted();
     test_hooks_->NotifyAllTileTasksCompleted(this);
   }
 
   void BlockNotifyReadyToActivateForTesting(bool block) override {
-    CHECK(task_runner_provider()->ImplThreadTaskRunner())
-        << "Not supported for single-threaded mode.";
+    // Not supported for single-threaded mode.
+    CHECK(task_runner_provider()->ImplThreadTaskRunner());
     block_notify_ready_to_activate_for_testing_ = block;
     if (!block && notify_ready_to_activate_was_blocked_) {
       task_runner_provider_->ImplThreadTaskRunner()->PostTask(
           FROM_HERE,
           base::Bind(&LayerTreeHostImplForTesting::NotifyReadyToActivate,
                      base::Unretained(this)));
       notify_ready_to_activate_was_blocked_ = false;
     }
   }
 
@@ skipping 708 matching lines @@
   DCHECK(!IsRemoteTest());
   return layer_tree_host_in_process_;
 }
 
 Proxy* LayerTreeTest::proxy() {
   return layer_tree_host_in_process() ? layer_tree_host_in_process()->proxy()
                                       : NULL;
 }
 
 }  // namespace cc