base: Remove the string logging from CHECK().

mojo/edk/test/mojo_test_base.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 "mojo/edk/test/mojo_test_base.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "mojo/edk/embedder/embedder.h"
@@ skipping 54 matching lines @@
 #endif
   helper_.set_process_error_callback(process_error_callback);
   pipe_ = helper_.StartChild(client_name, launch_type);
 #if defined(OS_MACOSX)
   g_mach_broker->AddPlaceholderForPid(helper_.test_child().Handle());
 #endif
 #endif
 }
 
 MojoTestBase::ClientController::~ClientController() {
-  CHECK(was_shutdown_)
-      << "Test clients should be waited on explicitly with WaitForShutdown().";
+  // Test clients should be waited on explicitly with WaitForShutdown().
+  CHECK(was_shutdown_);
 }
 
 void MojoTestBase::ClientController::ClosePeerConnection() {
 #if !defined(OS_IOS)
   helper_.ClosePeerConnection();
 #endif
 }
 
 int MojoTestBase::ClientController::WaitForShutdown() {
   was_shutdown_ = true;
@@ skipping 222 matching lines @@
                          MOJO_WRITE_DATA_FLAG_ALL_OR_NONE),
            MOJO_RESULT_OK);
   CHECK_EQ(num_bytes, static_cast<uint32_t>(size));
 
   return std::string(buffer.data(), buffer.size());
 }
 
 }  // namespace test
 }  // namespace edk
 }  // namespace mojo