base: Remove the string logging from CHECK().

base/check_example.cc

 // Copyright (c) 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.
 
 // This file is meant for analyzing the code generated by the CHECK
 // macros in a small executable file that's easy to disassemble.
 
 #include "base/logging.h"
 
 // An official build shouldn't generate code to print out messages for
 // the CHECK* macros, nor should it have the strings in the
 // executable.
 
 void DoCheck(bool b) {
-  CHECK(b) << "DoCheck " << b;
+  // DoCheck |b|
+  CHECK(b);
 }
 
 void DoCheckEq(int x, int y) {
   CHECK_EQ(x, y);
 }
 
 int main(int argc, const char* argv[]) {
   DoCheck(argc > 1);
   DoCheckEq(argc, 1);
 }