Switch components/password_manager code from IPC messages to Mojo.

components/password_manager/content/public/interfaces/credential_manager.mojom

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module password_manager.mojom;
+
+import "url/mojo/origin.mojom";
+
+enum CredentialType {
+  EMPTY,
+  PASSWORD,
+  FEDERATED
+};
+
+enum CredentialManagerError {
+  SUCCESS,
+  DISABLED,
+  PENDINGREQUEST,
+  PASSWORDSTOREUNAVAILABLE,
+  UNKNOWN
+};
+
+struct CredentialInfo {
+  CredentialType type;
+  string id;
+  string name;
+  string icon;
+  string password;
+  url.mojom.Origin federation;
+};
+
+interface CredentialManager {
+  // Store credential. For navigator.credentials.store().
+  Store(CredentialInfo credential) => ();
+
+  // Require user mediation. For navigator.credentials.requireUserMediation().
+  RequireUserMediation() => ();
+
+  // Request Credential. For navigator.credentials.get().
+  // The result callback will return a non-null and valid CredentialInfo if succeeded,

[vabr (Chromium), 2016/03/09 16:26:29]

I'm not sure about the indentation rules for .mojom, but in general lines should
be max. 80 characters long.
(Also on line 44.)

[leonhsl(Using Gerrit), 2016/03/10 06:42:41]

Done. Keep lines length within 80 characters and mimic indentation rules from
other .mojom files.

+  // or null with a CredentialManagerError if failed.
+  Get(bool zero_click_only,
+      bool include_passwords,
+      array<string> federations) => (CredentialManagerError error, CredentialInfo? credential);
+};