Begun the DCHECK() cleanup. Starting off with /src/chrome/a* and /src/chrome/...

chrome/app/breakpad_mac.mm

 // Copyright (c) 2010 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 "chrome/app/breakpad_mac.h"
 
 #include <CoreFoundation/CoreFoundation.h>
 #import <Foundation/Foundation.h>
 
 #include "base/base_switches.h"
@@ skipping 27 matching lines @@
 
 void DestructCrashReporter() {
   if (gBreakpadRef) {
     BreakpadRelease(gBreakpadRef);
     gBreakpadRef = NULL;
   }
 }
 
 // Only called for a branded build of Chrome.app.
 void InitCrashReporter() {
-  DCHECK(gBreakpadRef == NULL);
+  DCHECK(!gBreakpadRef);
   base::mac::ScopedNSAutoreleasePool autorelease_pool;
 
   // Check whether crash reporting should be enabled. If enterprise
   // configuration management controls crash reporting, it takes precedence.
   // Otherwise, check whether the user has consented to stats and crash
   // reporting. The browser process can make this determination directly.
   // Helper processes may not have access to the disk or to the same data as
   // the browser process, so the browser passes the decision to them on the
   // command line.
   NSBundle* main_bundle = base::mac::MainAppBundle();
@@ skipping 137 matching lines @@
   BreakpadAddUploadParameter(gBreakpadRef, key, value);
 }
 
 void ClearCrashKeyValue(NSString* key) {
   if (gBreakpadRef == NULL) {
     return;
   }
 
   BreakpadRemoveUploadParameter(gBreakpadRef, key);
 }