Refactor SecurityStateModel/Clients for simplicity and reusability.

chrome/browser/ui/cocoa/browser_window_cocoa.h

Index: chrome/browser/ui/cocoa/browser_window_cocoa.h
diff --git a/chrome/browser/ui/cocoa/browser_window_cocoa.h b/chrome/browser/ui/cocoa/browser_window_cocoa.h
index 9547f550e6ad0902838b35677d07ec813d2e0508..4914e4948731aa75bccf0e519c22b4c834f0d9d1 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.h
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.h
@@ -13,7 +13,6 @@
 #include "chrome/browser/ui/tabs/tab_utils.h"
 #include "chrome/common/features.h"
 #include "components/bookmarks/browser/bookmark_model.h"
-#include "components/security_state/security_state_model.h"
 #include "ui/base/ui_base_types.h"
 
 class Browser;
@@ -29,6 +28,10 @@ class Command;
 class Extension;
 }
 
+namespace security_state {
+struct SecurityInfo;
+}  // namespace security_state
+
 // An implementation of BrowserWindow for Cocoa. Bridges between C++ and
 // the Cocoa NSWindow. Cross-platform code will interact with this object when
 // it needs to manipulate the window.
@@ -129,8 +132,7 @@ class BrowserWindowCocoa
       Profile* profile,
       content::WebContents* web_contents,
       const GURL& virtual_url,
-      const security_state::SecurityStateModel::SecurityInfo& security_info)
-      override;
+      const security_state::SecurityInfo& security_info) override;
   void ShowAppMenu() override;
   bool PreHandleKeyboardEvent(const content::NativeWebKeyboardEvent& event,
                               bool* is_keyboard_shortcut) override;