Improve some naming

chrome/browser/themes/theme_syncable_service.cc

Index: chrome/browser/themes/theme_syncable_service.cc
diff --git a/chrome/browser/themes/theme_syncable_service.cc b/chrome/browser/themes/theme_syncable_service.cc
index 671a01fb569646e9d64732de0ca7937d5d76931c..fe140519e2bfe540438366ab3a7882d2a88ec00f 100644
--- a/chrome/browser/themes/theme_syncable_service.cc
+++ b/chrome/browser/themes/theme_syncable_service.cc
@@ -243,8 +243,8 @@ void ThemeSyncableService::SetCurrentThemeFromThemeSpecifics(
       extensions_service->CheckForUpdatesSoon();
     }
   } else if (theme_specifics.use_system_theme_by_default()) {
-    DVLOG(1) << "Switch to use native theme";
-    theme_service_->SetNativeTheme();
+    DVLOG(1) << "Switch to use system theme";
+    theme_service_->UseSystemTheme();
   } else {
     DVLOG(1) << "Switch to use default theme";
     theme_service_->UseDefaultTheme();
@@ -269,7 +269,7 @@ bool ThemeSyncableService::GetThemeSpecificsFromCurrentTheme(
     // On platform where system theme is different from default theme, set
     // use_system_theme_by_default to true if system theme is used, false
     // if default system theme is used. Otherwise restore it to value in sync.
-    if (theme_service_->UsingNativeTheme()) {
+    if (theme_service_->UsingSystemTheme()) {
       theme_specifics->set_use_system_theme_by_default(true);
     } else if (theme_service_->UsingDefaultTheme()) {
       theme_specifics->set_use_system_theme_by_default(false);