Add ContextualSuggestionsService to Omnibox

components/contextual_suggestions/BUILD.gn

Index: components/contextual_suggestions/BUILD.gn
diff --git a/components/contextual_suggestions/BUILD.gn b/components/contextual_suggestions/BUILD.gn
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index 0000000000000000000000000000000000000000..7d188b396038a0e190eed73d0b20884c64447d3b
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+++ b/components/contextual_suggestions/BUILD.gn
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+# Copyright 2017 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.
+
+static_library("contextual_suggestions") {
+  sources = [
+    "contextual_suggestions_service.cc",
+    "contextual_suggestions_service.h",
+    "features.cc",
+    "features.h",
+  ]
+  public_deps = [
+    "//net",
+    "//url",
+  ]
+  deps = [
+    "//base",
+    "//components/data_use_measurement/core",
+    "//components/keyed_service/core",
+    "//components/search_engines",
+    "//components/signin/core/browser",
+    "//components/variations/net",
+    "//google_apis",
+  ]
+}