[Sync] Rename syncable_prefs to sync_preferences.

components/browser_sync/BUILD.gn

Index: components/browser_sync/BUILD.gn
diff --git a/components/browser_sync/BUILD.gn b/components/browser_sync/BUILD.gn
index d7a68ac4aae35f4695b93a442f6d848c64d312c2..1949c1cf71ba1b6d77dc389152326e88ee653b52 100644
--- a/components/browser_sync/BUILD.gn
+++ b/components/browser_sync/BUILD.gn
@@ -36,8 +36,8 @@ static_library("browser_sync") {
     "//components/signin/core/browser",
     "//components/strings",
     "//components/sync_bookmarks",
+    "//components/sync_preferences",
     "//components/sync_sessions",
-    "//components/syncable_prefs",
     "//components/variations",
     "//components/version_info",
     "//components/version_info:generate_version_info",
@@ -82,10 +82,10 @@ source_set("unit_tests") {
     "//components/sync:test_support_engine",
     "//components/sync:test_support_model",
     "//components/sync_bookmarks:sync_bookmarks",
+    "//components/sync_preferences",
+    "//components/sync_preferences:test_support",
     "//components/sync_sessions",
     "//components/sync_sessions:test_support",
-    "//components/syncable_prefs",
-    "//components/syncable_prefs:test_support",
     "//components/version_info",
     "//components/version_info:generate_version_info",
     "//components/webdata_services:test_support",
@@ -126,8 +126,8 @@ static_library("test_support") {
     "//components/sync",
     "//components/sync:test_support_driver",
     "//components/sync:test_support_engine",
+    "//components/sync_preferences:test_support",
     "//components/sync_sessions:test_support",
-    "//components/syncable_prefs:test_support",
     "//google_apis",
     "//net:test_support",
     "//testing/gmock",