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

chrome/common/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/buildflag_header.gni")
 import("//chrome/common/features.gni")
 import("//chrome/version.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/grit_rule.gni")
 
@@ skipping 420 matching lines @@
     "resource_usage_reporter.mojom",
     "shell_handler_win.mojom",
   ]
 
   public_deps = [
     "//skia/public/interfaces",
   ]
 
   use_new_wrapper_types = false
 }
-
-mojom("search_provider_mojom") {
-  sources = [
-    "search_provider.mojom",
-  ]
-
-  public_deps = [
-    "//url/mojo:url_mojom_gurl",
-  ]
-}