base: Remove the string logging from CHECK().

components/metrics/leak_detector/leak_detector.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 "components/metrics/leak_detector/leak_detector.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 
@@ skipping 176 matching lines @@
 #endif  // defined(OS_CHROMEOS)
 
   task_runner_ = task_runner;
 
   // CustomAllocator can use the default allocator, as long as the hook
   // functions can handle recursive calls.
   leak_detector::CustomAllocator::Initialize();
 
   // The initialization should be done only once. Check for this by examining
   // whether |impl_| has already been initialized.
-  CHECK(!impl_.get()) << "Cannot initialize LeakDetector more than once!";
+  // Cannot initialize LeakDetector more than once!
+  CHECK(!impl_.get());
   impl_.reset(new leak_detector::LeakDetectorImpl(
       mapping.addr, mapping.size, params.size_suspicion_threshold(),
       params.call_stack_suspicion_threshold()));
 
   // Register allocator hook functions. This must be done last since the
   // preceding code will need to call the allocator.
   base::allocator::SetHooks(&AllocHook, &FreeHook);
 }
 
 void LeakDetector::AddObserver(Observer* observer) {
@@ skipping 138 matching lines @@
   }
 
   {
     base::AutoLock lock(observers_lock_);
     for (Observer& observer : observers_)
       observer.OnLeaksFound(reports);
   }
 }
 
 }  // namespace metrics