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

content/browser/renderer_host/render_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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 999 matching lines @@
     switches::kEnableAcceleratedOverflowScroll,
     switches::kEnableAcceleratedScrollableFrames,
     switches::kEnableAccessibilityLogging,
     switches::kEnableADTSStreamParser,
     switches::kEnableBeginFrameScheduling,
     switches::kEnableBleedingEdgeRenderingFastPaths,
     switches::kEnableBrowserPluginForAllViewTypes,
     switches::kEnableCompositedScrollingForFrames,
     switches::kEnableCompositingForFixedPosition,
     switches::kEnableCompositingForTransition,
-    switches::kEnableDCHECK,
     switches::kEnableDeferredImageDecoding,
     switches::kEnableDelegatedRenderer,
     switches::kEnableEncryptedMedia,
     switches::kEnableExperimentalCanvasFeatures,
     switches::kEnableExperimentalWebPlatformFeatures,
     switches::kEnableExperimentalWebSocket,
     switches::kEnableFastTextAutosizing,
     switches::kEnableGPUClientLogging,
     switches::kEnableGpuClientTracing,
     switches::kEnableGPUServiceLogging,
@@ skipping 1061 matching lines @@
 
 void RenderProcessHostImpl::DecrementWorkerRefCount() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK_GT(worker_ref_count_, 0);
   --worker_ref_count_;
   if (worker_ref_count_ == 0)
     Cleanup();
 }
 
 }  // namespace content