Let DCHECK in non-official-release build be opt-in with dcheck_always_on=1 only

content/browser/browser_child_process_host_impl.cc

 // Copyright (c) 2012 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 "content/browser/browser_child_process_host_impl.h"
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 127 matching lines @@
 #endif
     CommandLine* cmd_line) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   GetContentClient()->browser()->AppendExtraCommandLineSwitches(
       cmd_line, data_.id);
 
   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
   static const char* kForwardSwitches[] = {
     switches::kDisableLogging,
-    switches::kEnableDCHECK,
     switches::kEnableLogging,
     switches::kLoggingLevel,
     switches::kTraceToConsole,
     switches::kV,
     switches::kVModule,
 #if defined(OS_POSIX)
     switches::kChildCleanExit,
 #endif
 #if defined(OS_WIN)
     switches::kEnableHighResolutionTime,
@@ skipping 205 matching lines @@
 
 void BrowserChildProcessHostImpl::OnProcessExitedEarly(
     base::WaitableEvent* event) {
   DeleteProcessWaitableEvent(event);
   OnChildDisconnected();
 }
 
 #endif
 
 }  // namespace content