Fix a regression where the omnibox would re-enter extension keyword mode after

chrome/browser/autocomplete/keyword_provider.cc

Index: chrome/browser/autocomplete/keyword_provider.cc
diff --git a/chrome/browser/autocomplete/keyword_provider.cc b/chrome/browser/autocomplete/keyword_provider.cc
index 693d824c7cafcd8581725be43f5fa9e29ce736fa..abf30e09e1ba0892b8fb7066315d4a711c83e7fa 100644
--- a/chrome/browser/autocomplete/keyword_provider.cc
+++ b/chrome/browser/autocomplete/keyword_provider.cc
@@ -461,8 +461,10 @@ void KeywordProvider::Observe(NotificationType type,
   switch (type.value) {
     case NotificationType::EXTENSION_OMNIBOX_INPUT_ENTERED:
       // Input has been accepted, so we're done with this input session. Ensure
-      // we don't send the OnInputCancelled event.
+      // we don't send the OnInputCancelled event, or handle any more stray
+      // suggestions_ready events.
       current_keyword_extension_id_.clear();
+      current_input_id_ = 0;
       return;
 
     case NotificationType::EXTENSION_OMNIBOX_DEFAULT_SUGGESTION_CHANGED: {