Eliminate unnecessary forward declarations from components/password_manager

components/password_manager/core/browser/password_manager.h

Index: components/password_manager/core/browser/password_manager.h
diff --git a/components/password_manager/core/browser/password_manager.h b/components/password_manager/core/browser/password_manager.h
index 3d3473d1ad979d64fdbeff5fd37ba9a892b42b29..c89e6e537ad2ae1b8a4296acef0c45da6e9bae62 100644
--- a/components/password_manager/core/browser/password_manager.h
+++ b/components/password_manager/core/browser/password_manager.h
@@ -21,10 +21,6 @@
 
 class PrefRegistrySimple;
 
-namespace content {
-class WebContents;
-}
-
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
@@ -34,7 +30,6 @@ namespace password_manager {
 class BrowserSavePasswordProgressLogger;
 class PasswordManagerClient;
 class PasswordManagerDriver;
-class PasswordManagerTest;
 class PasswordFormManager;
 
 // Per-tab password manager. Handles creation and management of UI elements,