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

chrome/renderer/chrome_render_process_observer.cc

Index: chrome/renderer/chrome_render_process_observer.cc
diff --git a/chrome/renderer/chrome_render_process_observer.cc b/chrome/renderer/chrome_render_process_observer.cc
index 22fdc0ffbe03361476484f8b9837c3a66a834deb..6906adb6b9b42aea5679a65ce76ac21b3b0f1fd6 100644
--- a/chrome/renderer/chrome_render_process_observer.cc
+++ b/chrome/renderer/chrome_render_process_observer.cc
@@ -269,8 +269,17 @@ ChromeRenderProcessObserver::ChromeRenderProcessObserver(
 
 #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);