Introduce dynamic ablation of AutocompleteProviders using AC dynamic trials.

chrome/browser/autocomplete/autocomplete_field_trial.h

Index: chrome/browser/autocomplete/autocomplete_field_trial.h
diff --git a/chrome/browser/autocomplete/autocomplete_field_trial.h b/chrome/browser/autocomplete/autocomplete_field_trial.h
index 85ced0dfc8f64a02b5ca1028a29fda9c865666e0..6ee756c9d526dbcd8919286a7d66150d2195ea8b 100644
--- a/chrome/browser/autocomplete/autocomplete_field_trial.h
+++ b/chrome/browser/autocomplete/autocomplete_field_trial.h
@@ -24,6 +24,14 @@ class AutocompleteFieldTrial {
   // This method, unlike ActivateStaticTrials(), may be called multiple times.
   static void ActivateDynamicTrials();
 
+  // Returns a bitmap containing AutocompleteProvider::Type values
+  // that should be disabled in AutocompleteController.
+  // This method simply goes over all autocomplete dynamic field trial groups
+  // and looks for "ProvidersDisabled_NNN" substring in the group name
+  // (NNN is an integer corresponding to a bitmap mask).  The final result is
+  // all found bitmap masks OR-ed together.

[Mark P, 2013/02/11 21:13:34]

"all found".  ick.
please rephrase

[Bart N., 2013/02/11 21:42:12]

Ooops. Fixed.

+  static int GetDisabledProviderTypes();
+
   // ---------------------------------------------------------
   // For the inline History Quick Provider field trial.