[Sync] Rename syncable_prefs to sync_preferences.

components/sync_preferences/BUILD.gn

 # Copyright 2015 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/features.gni")
 
-static_library("syncable_prefs") {
+static_library("sync_preferences") {
   sources = [
     "pref_model_associator.cc",
     "pref_model_associator.h",
     "pref_model_associator_client.h",
     "pref_service_syncable.cc",
     "pref_service_syncable.h",
     "pref_service_syncable_factory.cc",
     "pref_service_syncable_factory.h",
     "pref_service_syncable_observer.h",
     "synced_pref_change_registrar.cc",
     "synced_pref_change_registrar.h",
     "synced_pref_observer.h",
   ]
 
   deps = [
     "//base",
     "//components/pref_registry",
     "//components/prefs",
     "//components/sync",
   ]
 
   if (enable_configuration_policy) {
     # This define is only used for compiling the .cc files in this target.
-    defines = [ "SYNCABLE_PREFS_USE_POLICY" ]
+    defines = [ "SYNC_PREFERENCES_USE_POLICY" ]
 
     deps += [ "//components/policy/core/browser" ]
   }
 }
 
 static_library("test_support") {
   testonly = true
   sources = [
     "pref_service_mock_factory.cc",
     "pref_service_mock_factory.h",
     "testing_pref_service_syncable.cc",
     "testing_pref_service_syncable.h",
   ]
 
   deps = [
-    ":syncable_prefs",
+    ":sync_preferences",
     "//base",
     "//components/pref_registry",
     "//components/prefs:test_support",
     "//testing/gtest",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "pref_model_associator_unittest.cc",
     "pref_service_syncable_unittest.cc",
   ]
 
   deps = [
-    ":syncable_prefs",
+    ":sync_preferences",
     ":test_support",
     "//components/pref_registry",
     "//components/prefs",
     "//components/sync",
     "//components/sync:test_support_model",
     "//testing/gtest",
   ]
 }