[Extensions] Convert some ChromeSyncExtensionFunctions

chrome/browser/extensions/api/content_settings/content_settings_api.h

Index: chrome/browser/extensions/api/content_settings/content_settings_api.h
diff --git a/chrome/browser/extensions/api/content_settings/content_settings_api.h b/chrome/browser/extensions/api/content_settings/content_settings_api.h
index a4706d13cc92807358486e52f4bcb845dd708041..95563d01ddca8cd9d296e5cd73724a4982d0508e 100644
--- a/chrome/browser/extensions/api/content_settings/content_settings_api.h
+++ b/chrome/browser/extensions/api/content_settings/content_settings_api.h
@@ -17,7 +17,7 @@ struct WebPluginInfo;
 namespace extensions {
 
 class ContentSettingsContentSettingClearFunction
-    : public ChromeSyncExtensionFunction {
+    : public UIThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("contentSettings.clear", CONTENTSETTINGS_CLEAR)
 
@@ -25,11 +25,11 @@ class ContentSettingsContentSettingClearFunction
   ~ContentSettingsContentSettingClearFunction() override {}
 
   // ExtensionFunction:
-  bool RunSync() override;
+  ResponseAction Run() override;
 };
 
 class ContentSettingsContentSettingGetFunction
-    : public ChromeSyncExtensionFunction {
+    : public UIThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("contentSettings.get", CONTENTSETTINGS_GET)
 
@@ -37,11 +37,11 @@ class ContentSettingsContentSettingGetFunction
   ~ContentSettingsContentSettingGetFunction() override {}
 
   // ExtensionFunction:
-  bool RunSync() override;
+  ResponseAction Run() override;
 };
 
 class ContentSettingsContentSettingSetFunction
-    : public ChromeSyncExtensionFunction {
+    : public UIThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("contentSettings.set", CONTENTSETTINGS_SET)
 
@@ -49,7 +49,7 @@ class ContentSettingsContentSettingSetFunction
   ~ContentSettingsContentSettingSetFunction() override {}
 
   // ExtensionFunction:
-  bool RunSync() override;
+  ResponseAction Run() override;
 };
 
 class ContentSettingsContentSettingGetResourceIdentifiersFunction