AutoFill Help Link added on Mac

chrome/browser/autofill/autofill_dialog_controller_mac.mm

Index: chrome/browser/autofill/autofill_dialog_controller_mac.mm
diff --git a/chrome/browser/autofill/autofill_dialog_controller_mac.mm b/chrome/browser/autofill/autofill_dialog_controller_mac.mm
index d39c4568b45ff2cd99b764fef152b7dbeb5ae51a..72c301b6123954d8ddd67bade6a7fabf9082a81b 100644
--- a/chrome/browser/autofill/autofill_dialog_controller_mac.mm
+++ b/chrome/browser/autofill/autofill_dialog_controller_mac.mm
@@ -7,6 +7,8 @@
 #include "app/resource_bundle.h"
 #include "base/mac_util.h"
 #include "base/sys_string_conversions.h"
+#include "chrome/browser/browser.h"
+#include "chrome/browser/browser_list.h"
 #import "chrome/browser/autofill/autofill_address_model_mac.h"
 #import "chrome/browser/autofill/autofill_address_sheet_controller_mac.h"
 #import "chrome/browser/autofill/autofill_credit_card_model_mac.h"
@@ -412,6 +414,15 @@ void PersonalDataManagerObserver::OnPersonalDataLoaded() {
   }
 }
 
+// Navigates to the AutoFill help url.
+- (IBAction)openHelp:(id)sender {
+  Browser* browser = BrowserList::GetLastActive();
+
+  if (!browser || !browser->GetSelectedTabContents())
+    browser = Browser::Create(profile_);
+  browser->OpenAutoFillHelpTabAndActivate();
+}
+
 // Edit address sheet was dismissed.  Non-zero |returnCode| indicates a save.
 - (void)addressEditDidEnd:(NSWindow *)sheet
                returnCode:(int)returnCode