base: Remove the string logging from CHECK().

ui/events/ozone/layout/keyboard_layout_engine_manager.cc

 // Copyright 2014 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 "ui/events/ozone/layout/keyboard_layout_engine_manager.h"
 
 #include "base/logging.h"
 #include "ui/events/ozone/layout/stub/stub_keyboard_layout_engine.h"
 
 namespace ui {
 
 // static
 KeyboardLayoutEngineManager* KeyboardLayoutEngineManager::instance_ = nullptr;
 
 KeyboardLayoutEngineManager::KeyboardLayoutEngineManager(
     KeyboardLayoutEngine* engine)
     : keyboard_layout_engine_(engine) {
-  CHECK(!instance_) << "Only one keyboard layout manager can be created.";
+  // Only one keyboard layout manager can be created.
+  CHECK(!instance_);
   instance_ = this;
 }
 
 KeyboardLayoutEngineManager::~KeyboardLayoutEngineManager() {
   CHECK_EQ(this, instance_);
   instance_ = NULL;
 }
 
 void KeyboardLayoutEngineManager::SetKeyboardLayoutEngine(
     std::unique_ptr<KeyboardLayoutEngine> engine) {
   if (instance_)
     instance_->keyboard_layout_engine_ = std::move(engine);
   else
     new KeyboardLayoutEngineManager(engine.release());
 }
 
 KeyboardLayoutEngine* KeyboardLayoutEngineManager::GetKeyboardLayoutEngine() {
   // TODO(kpschoedel): crbug.com/430194 This lazy initialization is a
   // workaround for not yet initializing KeyboardLayoutEngineManager
   // expliclity in all tests that need it.
   if (!instance_)
     new KeyboardLayoutEngineManager(new StubKeyboardLayoutEngine());
   return instance_->keyboard_layout_engine_.get();
 }
 
 }  // namespace ui