Revert 94073 (broke a ton of tests) - Introduce a field trial for Instant.

chrome/browser/autocomplete/autocomplete.h

Index: chrome/browser/autocomplete/autocomplete.h
===================================================================
--- chrome/browser/autocomplete/autocomplete.h	(revision 94076)
+++ chrome/browser/autocomplete/autocomplete.h	(working copy)
@@ -599,14 +599,13 @@
   AutocompleteController(Profile* profile,
                          AutocompleteControllerDelegate* delegate);
 #ifdef UNIT_TEST
-  AutocompleteController(const ACProviders& providers, Profile* profile)
+  explicit AutocompleteController(const ACProviders& providers)
       : delegate_(NULL),
         providers_(providers),
         keyword_provider_(NULL),
         search_provider_(NULL),
         done_(true),
-        in_start_(false),
-        profile_(profile) {
+        in_start_(false) {
   }
 #endif
   ~AutocompleteController();
@@ -729,8 +728,6 @@
   // notifications until Start() has been invoked on all providers.
   bool in_start_;
 
-  Profile* profile_;
-
   DISALLOW_COPY_AND_ASSIGN(AutocompleteController);
 };