Speculative revert to see if this change introduced a performance regression on Mac intl perf bots.

chrome/browser/automation/automation_provider.cc

Index: chrome/browser/automation/automation_provider.cc
===================================================================
--- chrome/browser/automation/automation_provider.cc	(revision 150796)
+++ chrome/browser/automation/automation_provider.cc	(working copy)
@@ -469,10 +469,11 @@
 
 Browser* AutomationProvider::FindAndActivateTab(
     NavigationController* controller) {
-  content::WebContentsDelegate* d = controller->GetWebContents()->GetDelegate();
-  if (d)
-    d->ActivateContents(controller->GetWebContents());
-  return browser::FindBrowserWithWebContents(controller->GetWebContents());
+  int tab_index;
+  Browser* browser = browser::FindBrowserForController(controller, &tab_index);
+  if (browser)
+    chrome::ActivateTabAt(browser, tab_index, true);
+  return browser;
 }
 
 void AutomationProvider::HandleFindRequest(