chrome: Cleanup class/struct forward declarations

chrome/browser/password_manager/account_chooser_dialog_android.h

Index: chrome/browser/password_manager/account_chooser_dialog_android.h
diff --git a/chrome/browser/password_manager/account_chooser_dialog_android.h b/chrome/browser/password_manager/account_chooser_dialog_android.h
index 3ddcf25ce1413f2f3ab645917775326c129d51b6..55a5b2b71dc97ea6c24235e61d260a7f511a0c09 100644
--- a/chrome/browser/password_manager/account_chooser_dialog_android.h
+++ b/chrome/browser/password_manager/account_chooser_dialog_android.h
@@ -18,10 +18,6 @@ namespace content {
 class WebContents;
 }
 
-namespace password_manager {
-struct CredentialInfo;
-}
-
 // Native counterpart for the android dialog which allows users to select
 // credentials which will be passed to the web site in order to log in the user.
 class AccountChooserDialogAndroid : public content::WebContentsObserver {