Print Preview: Add "print preview" back to about:flags; enable it by default just once.

content/browser/renderer_host/browser_render_process_host.cc

 // Copyright (c) 2011 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/browser_render_process_host.h"
 
 #include <algorithm>
@@ skipping 529 matching lines @@
     switches::kDisableDesktopNotifications,
     switches::kDisableDeviceOrientation,
     switches::kDisableFileSystem,
     switches::kDisableGeolocation,
     switches::kDisableGLMultisampling,
     switches::kDisableGLSLTranslator,
     switches::kDisableIndexedDatabase,
     switches::kDisableJavaScriptI18NAPI,
     switches::kDisableLocalStorage,
     switches::kDisableLogging,
-#if defined(GOOGLE_CHROME_BUILD) && !defined(OS_CHROMEOS) && !defined(OS_MACOSX)
-    // Enabled by default in Google Chrome builds, except on CrOS.
     switches::kDisablePrintPreview,
-#else
-    // Disabled by default in Chromium builds and on CrOS.
     switches::kEnablePrintPreview,
-#endif
     switches::kDisableSeccompSandbox,
     switches::kDisableSessionStorage,
     switches::kDisableSharedWorkers,
     switches::kDisableSpeechInput,
     switches::kDisableWebSockets,
     switches::kDomAutomationController,
     switches::kDumpHistogramsOnExit,
     switches::kEnableAcceleratedDecoding,
     switches::kEnableAdaptive,
     switches::kEnableBenchmarking,
@@ skipping 403 matching lines @@
 void BrowserRenderProcessHost::OnUserMetricsRecordAction(
     const std::string& action) {
   UserMetrics::RecordComputedAction(action);
 }
 
 void BrowserRenderProcessHost::OnRevealFolderInOS(const FilePath& path) {
   // Only honor the request if appropriate persmissions are granted.
   if (ChildProcessSecurityPolicy::GetInstance()->CanReadFile(id(), path))
     content::GetContentClient()->browser()->RevealFolderInOS(path);
 }