chrome: Cleanup class/struct forward declarations

chrome/browser/password_manager/chrome_password_manager_client.h

Index: chrome/browser/password_manager/chrome_password_manager_client.h
diff --git a/chrome/browser/password_manager/chrome_password_manager_client.h b/chrome/browser/password_manager/chrome_password_manager_client.h
index dea47f253ccde78899a882ee18526d78c2bbf196..1f9cbdcc4a777617bcef6a9665777d444d3d942e 100644
--- a/chrome/browser/password_manager/chrome_password_manager_client.h
+++ b/chrome/browser/password_manager/chrome_password_manager_client.h
@@ -33,12 +33,6 @@ namespace content {
 class WebContents;
 }
 
-namespace password_manager {
-struct CredentialInfo;
-class PasswordGenerationManager;
-class PasswordManagerDriver;
-}
-
 // ChromePasswordManagerClient implements the PasswordManagerClient interface.
 class ChromePasswordManagerClient
     : public password_manager::PasswordManagerClient,