Remove unused code in password_manager.h

It's leftover from https://chromium-review.googlesource.com/c/chromium/src/+/1026111
where these methods where moved to password_form_filling.h but their definition was
not removed from password_manager.h.

Bug: None
Change-Id: I51362bd8874dc89c0db5075cd4fbf403bdbacc49
Reviewed-on: https://chromium-review.googlesource.com/1044222Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556396}

components/password_manager/core/browser/password_manager.h

@@ -56,32 +56,6 @@ class PasswordManager : public LoginModel {
   explicit PasswordManager(PasswordManagerClient* client);
   ~PasswordManager() override;
 
-  // Called by a PasswordFormManager when it decides a form can be autofilled
-  // on the page.
-  void Autofill(
-      password_manager::PasswordManagerDriver* driver,
-      const autofill::PasswordForm& form_for_autofill,
-      const std::map<base::string16, const autofill::PasswordForm*>&
-          best_matches,
-      const std::vector<const autofill::PasswordForm*>& federated_matches,
-      const autofill::PasswordForm& preferred_match,
-      bool wait_for_username) const;
-
-  // Called by a PasswordFormManager when a page initially loads and it decides
-  // that a form can be autofilled on the page, but a menu of account options
-  // should be shown instead. Similar to Autofill() above, but does not fill; it
-  // only shows a selection of accounts.
-  //
-  // Currently used by the fill-on-account-select experiment only. See
-  // https://crbug.com/568713.
-  void ShowInitialPasswordAccountSuggestions(
-      password_manager::PasswordManagerDriver* driver,
-      const autofill::PasswordForm& form_for_autofill,
-      const std::map<base::string16, const autofill::PasswordForm*>&
-          best_matches,
-      const autofill::PasswordForm& preferred_match,
-      bool wait_for_username) const;
-
   // Called by a PasswordFormManager when it decides a HTTP auth dialog can be
   // autofilled.
   void AutofillHttpAuth(