Remove AppListMixer field trial.

chrome/browser/ui/app_list/search/search_controller_factory.cc

Index: chrome/browser/ui/app_list/search/search_controller_factory.cc
diff --git a/chrome/browser/ui/app_list/search/search_controller_factory.cc b/chrome/browser/ui/app_list/search/search_controller_factory.cc
index 3776d4695f0b89150d19b8317ad22eb9cccb80b1..bbe518c27b936533b5c40058da7ddc0e79db0f73 100644
--- a/chrome/browser/ui/app_list/search/search_controller_factory.cc
+++ b/chrome/browser/ui/app_list/search/search_controller_factory.cc
@@ -34,7 +34,6 @@ namespace {
 
 // Maximum number of results to show in each mixer group.
 const size_t kMaxAppsGroupResults = 4;
-// Ignored unless AppListMixer field trial is "Blended".
 const size_t kMaxOmniboxResults = 4;
 const size_t kMaxWebstoreResults = 2;
 const size_t kMaxSuggestionsResults = 6;
@@ -67,18 +66,12 @@ std::unique_ptr<SearchController> CreateSearchController(
                            HistoryFactory::GetForBrowserContext(profile)));
 
   // Add mixer groups. There are three main groups: apps, webstore and
-  // omnibox. The behaviour depends on the AppListMixer field trial:
-  // - If default: The apps and webstore groups each have a fixed
-  //   maximum number of results. The omnibox group fills the remaining slots
-  //   (with a minimum of one result).
-  // - If "Blended": Each group has a "soft" maximum number of results. However,
-  //   if a query turns up very few results, the mixer may take more than this
-  //   maximum from a particular group.
-  size_t apps_group_id = controller->AddGroup(kMaxAppsGroupResults, 3.0, 1.0);
-  size_t omnibox_group_id =
-      controller->AddOmniboxGroup(kMaxOmniboxResults, 2.0, 1.0);
-  size_t webstore_group_id =
-      controller->AddGroup(kMaxWebstoreResults, 1.0, 0.4);
+  // omnibox. Each group has a "soft" maximum number of results. However, if
+  // a query turns up very few results, the mixer may take more than this
+  // maximum from a particular group.
+  size_t apps_group_id = controller->AddGroup(kMaxAppsGroupResults, 1.0);
+  size_t omnibox_group_id = controller->AddGroup(kMaxOmniboxResults, 1.0);
+  size_t webstore_group_id = controller->AddGroup(kMaxWebstoreResults, 0.4);
 
   // Add search providers.
   controller->AddProvider(
@@ -94,7 +87,7 @@ std::unique_ptr<SearchController> CreateSearchController(
                               new WebstoreProvider(profile, list_controller)));
   if (IsSuggestionsSearchProviderEnabled()) {
     size_t suggestions_group_id =
-        controller->AddGroup(kMaxSuggestionsResults, 3.0, 1.0);
+        controller->AddGroup(kMaxSuggestionsResults, 1.0);
     controller->AddProvider(
         suggestions_group_id,
         std::unique_ptr<SearchProvider>(
@@ -107,7 +100,7 @@ std::unique_ptr<SearchController> CreateSearchController(
   if (app_list::switches::IsDriveSearchInChromeLauncherEnabled() &&
       !profile->IsGuestSession()) {
     size_t search_api_group_id =
-        controller->AddGroup(kMaxLauncherSearchResults, 0.0, 1.0);
+        controller->AddGroup(kMaxLauncherSearchResults, 1.0);
     controller->AddProvider(
         search_api_group_id,
         std::unique_ptr<SearchProvider>(new LauncherSearchProvider(profile)));