Remove unreleased web app frame code from ChromeOS

chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h

Index: chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
diff --git a/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h b/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
index 48b4bc43146f38445054fd59760c91f5f1344254..ac8134f5eaa627d8c2f404f10cb80a390a7f9bb4 100644
--- a/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
+++ b/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
@@ -18,7 +18,6 @@
 #endif
 
 class TabIconView;
-class WebAppLeftHeaderView;
 
 namespace ui {
 class Window;
@@ -98,11 +97,6 @@ class BrowserNonClientFrameViewMus : public BrowserNonClientFrameView,
   // scheme than browser windows.
   bool UsePackagedAppHeaderStyle() const;
 
-  // Returns true if the header should be painted with a WebApp header style.
-  // The WebApp header style has a back button and title along with the usual
-  // accoutrements.
-  bool UseWebAppHeaderStyle() const;
-
   // Layout the incognito button.
   void LayoutIncognitoButton();