Move SearchProvider implementation into Blink and make it a no-op.

chrome/common/search_provider.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 chrome.mojom;
-
-import "url/mojo/url.mojom";
-
-// The install state of the search provider (not installed, installed, default).
-enum InstallState {
-  // Equates to an access denied error.
-  DENIED = -1,
-
-  // DON'T CHANGE THE VALUES BELOW.
-  // All of the following values are manidated by the
-  // spec for window.external.IsSearchProviderInstalled.
-
-  // The search provider is not installed.
-  NOT_INSTALLED = 0,
-
-  // The search provider is in the user's set but is not
-  INSTALLED_BUT_NOT_DEFAULT = 1,
-
-  // The search provider is set as the user's default.
-  INSTALLED_AS_DEFAULT = 2
-};
-
-interface SearchProviderInstallState {
-  // Find out if the given url's security origin is installed as a search
-  // provider. The |page_url| is the requesting page and the |inquiry_url| is
-  // the search provider (e.g. www.google.com), expressed as a security origin
-  // URL.
-  [Sync]
-  GetInstallState(
-      url.mojom.Url page_url,
-      url.mojom.Url inquiry_url) => (InstallState install);
-};