Improve some naming

chrome/browser/ui/views/frame/opaque_browser_frame_view_linux.cc

Index: chrome/browser/ui/views/frame/opaque_browser_frame_view_linux.cc
diff --git a/chrome/browser/ui/views/frame/opaque_browser_frame_view_linux.cc b/chrome/browser/ui/views/frame/opaque_browser_frame_view_linux.cc
index 2c58ffe491933970ad926872a44a1b81406f3384..043b55f526c1c25540a927072e7d374ee6264c4c 100644
--- a/chrome/browser/ui/views/frame/opaque_browser_frame_view_linux.cc
+++ b/chrome/browser/ui/views/frame/opaque_browser_frame_view_linux.cc
@@ -31,10 +31,10 @@ OpaqueBrowserFrameViewLinux::~OpaqueBrowserFrameViewLinux() {
     ui->RemoveWindowButtonOrderObserver(this);
 }
 
-bool OpaqueBrowserFrameViewLinux::IsUsingNativeTheme() {
-  // On X11, this does the correct thing. On Windows, UsingNativeTheme() will
+bool OpaqueBrowserFrameViewLinux::IsUsingSystemTheme() {
+  // On X11, this does the correct thing. On Windows, UsingSystemTheme() will
   // return true when using the default blue theme too.
-  return theme_service_->UsingNativeTheme();
+  return theme_service_->UsingSystemTheme();
 }
 
 ///////////////////////////////////////////////////////////////////////////////