Cleanup: Remove unused SearchTermsTracker

chrome/browser/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/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 3446 matching lines @@
       "renderer_context_menu/render_view_context_menu.cc",
       "renderer_context_menu/render_view_context_menu.h",
       "renderer_context_menu/spelling_bubble_model.cc",
       "renderer_context_menu/spelling_bubble_model.h",
       "renderer_context_menu/spelling_menu_observer.cc",
       "renderer_context_menu/spelling_menu_observer.h",
       "repost_form_warning_controller.cc",
       "repost_form_warning_controller.h",
       "search/local_ntp_source.cc",
       "search/local_ntp_source.h",
-      "search/search_terms_tracker.cc",
-      "search/search_terms_tracker.h",
       "signin/signin_promo.cc",
       "signin/signin_promo.h",
       "signin/signin_ui_util.cc",
       "signin/signin_ui_util.h",
       "speech/extension_api/tts_extension_api_constants.cc",  # Should be moved to extensions section?
       "speech/extension_api/tts_extension_api_constants.h",
       "ssl/ssl_client_auth_observer.cc",
       "ssl/ssl_client_auth_observer.h",
       "status_icons/desktop_notification_balloon.cc",
       "status_icons/desktop_notification_balloon.h",
@@ skipping 1184 matching lines @@
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }
 
 service_manifest("preferences_forwarder_manifest") {
   name = "preferences_forwarder"
   source = "prefs/forwarder_manifest.json"
 }