[rAC, OSX] enable rAC by default for Dev/Canary.

chrome/renderer/chrome_render_process_observer.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 "chrome/renderer/chrome_render_process_observer.h"
 
 #include <limits>
 #include <vector>
 
 #include "base/allocator/allocator_extension.h"
@@ skipping 251 matching lines @@
       pending_cache_min_dead_capacity_(0),
       pending_cache_max_dead_capacity_(0),
       pending_cache_capacity_(kUnitializedCacheCapacity) {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kEnableWatchdog)) {
     // TODO(JAR): Need to implement renderer IO msgloop watchdog.
   }
 
 #if defined(ENABLE_AUTOFILL_DIALOG)
 #if defined(OS_MACOSX)
+  // Interactive autocomplete is on by default for Dev/Canary, off by default
+  // for Beta/Stable.
   bool enableAutofill = command_line.HasSwitch(
       autofill::switches::kEnableInteractiveAutocomplete);
+
+  chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
+  if (channel != chrome::VersionInfo::CHANNEL_BETA &&
+      channel != chrome::VersionInfo::CHANNEL_STABLE) {
+    enableAutofill = !command_line.HasSwitch(
+    autofill::switches::kDisableInteractiveAutocomplete);
+  }
 #else
   bool enableAutofill = !command_line.HasSwitch(
       autofill::switches::kDisableInteractiveAutocomplete);
 #endif
   WebRuntimeFeatures::enableRequestAutocomplete(
       enableAutofill ||
       command_line.HasSwitch(switches::kEnableExperimentalWebPlatformFeatures));
 #endif
 
   RenderThread* thread = RenderThread::Get();
@@ skipping 166 matching lines @@
   if (clear_cache_pending_ && webkit_initialized_) {
     clear_cache_pending_ = false;
     WebCache::clear();
   }
 }
 
 const RendererContentSettingRules*
 ChromeRenderProcessObserver::content_setting_rules() const {
   return &content_setting_rules_;
 }