chrome: Cleanup class/struct forward declarations

chrome/browser/ui/login/login_interstitial_delegate.h

Index: chrome/browser/ui/login/login_interstitial_delegate.h
diff --git a/chrome/browser/ui/login/login_interstitial_delegate.h b/chrome/browser/ui/login/login_interstitial_delegate.h
index c8ec4fffe587372d5b9178820ddbf51b0d63795f..513240dd2873d9d7ad004988590058a5117239a7 100644
--- a/chrome/browser/ui/login/login_interstitial_delegate.h
+++ b/chrome/browser/ui/login/login_interstitial_delegate.h
@@ -14,16 +14,10 @@
 #include "content/public/browser/interstitial_page_delegate.h"
 #include "url/gurl.h"
 
-class LoginHandler;
-
 namespace content {
 class WebContents;
 }
 
-namespace net {
-class AuthChallengeInfo;
-}
-
 // Placeholder interstitial for HTTP login prompts. This interstitial makes the
 // omnibox show the correct url when the login prompt is visible.
 class LoginInterstitialDelegate : public content::InterstitialPageDelegate {