base: Remove the string logging from CHECK().

components/cronet/ios/Cronet.mm

 // 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.
 
 #import "components/cronet/ios/Cronet.h"
 
 #include <memory>
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ skipping 111 matching lines @@
       @"IDS_ACCEPT_LANGUAGES", @"Localizable", bundle, @"en-US,en",
       @"These values are copied from Chrome's .xtb files, so the same "
        "values are used in the |Accept-Language| header. Key name matches "
        "Chrome's.");
   if (acceptLanguages == Nil)
     acceptLanguages = @"";
   return acceptLanguages;
 }
 
 + (void)checkNotStarted {
-  CHECK(gChromeNet == NULL) << "Cronet is already started.";
+  // Cronet is already started.
+  CHECK(gChromeNet == NULL);
 }
 
 + (void)setHttp2Enabled:(BOOL)http2Enabled {
   [self checkNotStarted];
   gHttp2Enabled = http2Enabled;
 }
 
 + (void)setQuicEnabled:(BOOL)quicEnabled {
   [self checkNotStarted];
   gQuicEnabled = quicEnabled;
@@ skipping 136 matching lines @@
       base::SysNSStringToUTF8(hostResolverRulesForTesting));
 }
 
 // This is a non-public dummy method that prevents the linker from stripping out
 // the otherwise non-referenced methods from 'bidirectional_stream.cc'.
 + (void)preventStrippingCronetBidirectionalStream {
   bidirectional_stream_create(NULL, 0, 0);
 }
 
 @end