Assume all providers may give zero suggest responses.

chrome/browser/autocomplete/autocomplete_provider_unittest.cc

Index: chrome/browser/autocomplete/autocomplete_provider_unittest.cc
diff --git a/chrome/browser/autocomplete/autocomplete_provider_unittest.cc b/chrome/browser/autocomplete/autocomplete_provider_unittest.cc
index d6ccc09a8bfa7dd79a170937f376a5ec41eb753c..229924a46ead4ec79cb8d67f9aba136ca740ef37 100644
--- a/chrome/browser/autocomplete/autocomplete_provider_unittest.cc
+++ b/chrome/browser/autocomplete/autocomplete_provider_unittest.cc
@@ -57,7 +57,9 @@ class TestProvider : public AutocompleteProvider {
         match_keyword_(match_keyword) {
   }
 
-  void Start(const AutocompleteInput& input, bool minimal_changes) override;
+  void Start(const AutocompleteInput& input,
+             bool minimal_changes,
+             bool called_due_to_focus) override;
 
   void set_listener(AutocompleteProviderListener* listener) {
     listener_ = listener;
@@ -83,12 +85,16 @@ class TestProvider : public AutocompleteProvider {
 };
 
 void TestProvider::Start(const AutocompleteInput& input,
-                         bool minimal_changes) {
+                         bool minimal_changes,
+                         bool called_due_to_focus) {
   if (minimal_changes)
     return;
 
   matches_.clear();
 
+  if (called_due_to_focus)
+    return;
+
   // Generate 4 results synchronously, the rest later.
   AddResults(0, 1);
   AddResultsWithSearchTermsArgs(