Delete PasswordStoreMac and SimplePasswordStoreMac.

Keychain usage for passwords is finally deprecated. The only functional change for the users is that we stop cleaning up the passwords in Keychain. PasswordStoreMac wasn't instantiated before this CL.

BUG=466638

Review-Url: https://codereview.chromium.org/2909283002
Cr-Commit-Position: refs/heads/master@{#475547}

chrome/browser/BUILD.gn

@@ -888,15 +888,10 @@ split_static_library("browser") {
     "password_manager/password_manager_util_win.h",
     "password_manager/password_store_factory.cc",
     "password_manager/password_store_factory.h",
-    "password_manager/password_store_mac.cc",
-    "password_manager/password_store_mac.h",
-    "password_manager/password_store_mac_internal.h",
     "password_manager/password_store_proxy_mac.cc",
     "password_manager/password_store_proxy_mac.h",
     "password_manager/password_store_win.cc",
     "password_manager/password_store_win.h",
-    "password_manager/simple_password_store_mac.cc",
-    "password_manager/simple_password_store_mac.h",
     "payments/ssl_validity_checker.cc",
     "payments/ssl_validity_checker.h",
     "performance_monitor/performance_monitor.cc",

chrome/browser/password_manager/password_store_factory.cc

@@ -174,8 +174,8 @@ PasswordStoreFactory::BuildServiceInstanceFor(
           os_crypt::switches::kUseMockKeychain)
           ? new crypto::MockAppleKeychain()
           : new crypto::AppleKeychain());
-  ps = new PasswordStoreProxyMac(main_thread_runner, std::move(keychain),
-                                 std::move(login_db), profile->GetPrefs());
+  ps = new PasswordStoreProxyMac(main_thread_runner, std::move(login_db),
+                                 profile->GetPrefs());
 #elif defined(OS_CHROMEOS) || defined(OS_ANDROID)
   // For now, we use PasswordStoreDefault. We might want to make a native
   // backend for PasswordStoreX (see below) in the future though.