Fix comments of KeyedService factories.

The GetDefaultFactory return a factory that can create instance as
the default factory does. It can be used by factories when default
is to not create the instance for test BrowserStates.

Bug: none
Change-Id: I02192ff82e16748eb8f7b69a4c482b3589527b5b
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Reviewed-on: https://chromium-review.googlesource.com/811085Reviewed-by: Elodie Banel <lod@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522430}

ios/chrome/browser/autocomplete/autocomplete_classifier_factory.h

@@ -29,9 +29,8 @@ class AutocompleteClassifierFactory : public BrowserStateKeyedServiceFactory {
       ios::ChromeBrowserState* browser_state);
   static AutocompleteClassifierFactory* GetInstance();
 
-  // Returns the default factory used to build AutocompleteClassifier. Can be
-  // registered with SetTestingFactory to use the AutocompleteClassifier
-  // instance during testing.
+  // Returns the default factory used to build AutocompleteClassifiers. Can be
+  // registered with SetTestingFactory to use real instances during testing.
   static TestingFactoryFunction GetDefaultFactory();
 
  private:

ios/chrome/browser/autocomplete/in_memory_url_index_factory.h

@@ -29,9 +29,8 @@ class InMemoryURLIndexFactory : public BrowserStateKeyedServiceFactory {
       ios::ChromeBrowserState* browser_state);
   static InMemoryURLIndexFactory* GetInstance();
 
-  // Returns the default factory used to build InMemoryURLIndex. Can be
-  // registered with SetTestingFactory to use the InMemoryURLIndex instance
-  // during testing.
+  // Returns the default factory used to build InMemoryURLIndexs. Can be
+  // registered with SetTestingFactory to use real instances during testing.
   static TestingFactoryFunction GetDefaultFactory();
 
  private:

ios/chrome/browser/favicon/ios_chrome_large_icon_service_factory.h

@@ -35,9 +35,8 @@ class IOSChromeLargeIconServiceFactory
 
   static IOSChromeLargeIconServiceFactory* GetInstance();
 
-  // Returns the default factory used to build IOSChromeLargeIconServiceFactory.
-  // Can be registered with SetTestingFactory to use the
-  // IOSChromeLargeIconServiceFactory instance during testing.
+  // Returns the default factory used to build LargeIconServices. Can be
+  // registered with SetTestingFactory to use real instances during testing.
   static TestingFactoryFunction GetDefaultFactory();
 
  private:

ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc

@@ -20,12 +20,6 @@
 
 using ntp_snippets::ContentSuggestionsService;
 
-// static
-IOSChromeContentSuggestionsServiceFactory*
-IOSChromeContentSuggestionsServiceFactory::GetInstance() {
-  return base::Singleton<IOSChromeContentSuggestionsServiceFactory>::get();
-}
-
 // static
 ContentSuggestionsService*
 IOSChromeContentSuggestionsServiceFactory::GetForBrowserState(
@@ -35,6 +29,12 @@ IOSChromeContentSuggestionsServiceFactory::GetForBrowserState(
       GetInstance()->GetServiceForBrowserState(browser_state, true));
 }
 
+// static
+IOSChromeContentSuggestionsServiceFactory*
+IOSChromeContentSuggestionsServiceFactory::GetInstance() {
+  return base::Singleton<IOSChromeContentSuggestionsServiceFactory>::get();
+}
+
 // static
 BrowserStateKeyedServiceFactory::TestingFactoryFunction
 IOSChromeContentSuggestionsServiceFactory::GetDefaultFactory() {

ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.h

@@ -28,12 +28,13 @@ class ContentSuggestionsService;
 class IOSChromeContentSuggestionsServiceFactory
     : public BrowserStateKeyedServiceFactory {
  public:
-  static IOSChromeContentSuggestionsServiceFactory* GetInstance();
   static ntp_snippets::ContentSuggestionsService* GetForBrowserState(
       ios::ChromeBrowserState* browser_state);
-  // Returns the default factory used to build ContentSuggestionsService. Can be
-  // registered with SetTestingFactory to use the ContentSuggestionsService
-  // instance during testing.
+
+  static IOSChromeContentSuggestionsServiceFactory* GetInstance();
+
+  // Returns the default factory used to build ContentSuggestionsServices. Can
+  // be registered with SetTestingFactory to use real instances during testing.
   static TestingFactoryFunction GetDefaultFactory();
 
  private:

ios/chrome/browser/search_engines/template_url_service_factory.h

@@ -27,11 +27,11 @@ class TemplateURLServiceFactory : public BrowserStateKeyedServiceFactory {
  public:
   static TemplateURLService* GetForBrowserState(
       ios::ChromeBrowserState* browser_state);
+
   static TemplateURLServiceFactory* GetInstance();
 
-  // Returns the default factory used to build TemplateURLService. Can be
-  // registered with SetTestingFactory to use the TemplateURLService instance
-  // during testing.
+  // Returns the default factory used to build TemplateURLServices. Can be
+  // registered with SetTestingFactory to use real instances during testing.
   static TestingFactoryFunction GetDefaultFactory();
 
  private:

ios/chrome/browser/sessions/ios_chrome_tab_restore_service_factory.h

@@ -33,9 +33,8 @@ class IOSChromeTabRestoreServiceFactory
 
   static IOSChromeTabRestoreServiceFactory* GetInstance();
 
-  // Returns the default factory used to build TabRestoreService. Can be
-  // registered with SetTestingFactory to use the TabRestoreService instance
-  // during testing.
+  // Returns the default factory used to build TabRestoreServices. Can be
+  // registered with SetTestingFactory to use real instances during testing.
   static TestingFactoryFunction GetDefaultFactory();
 
  private: