[Sync] Fix namespaces for the sync_sessions component.

components/sync_sessions/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.
 
 # GYP version: components/sync_sessions.gypi:sync_sessions
 static_library("sync_sessions") {
   sources = [
     "favicon_cache.cc",
     "favicon_cache.h",
     "local_session_event_router.h",
@@ skipping 31 matching lines @@
     "synced_session_tracker.h",
     "synced_tab_delegate.cc",
     "synced_tab_delegate.h",
     "synced_window_delegate.h",
     "synced_window_delegates_getter.cc",
     "synced_window_delegates_getter.h",
     "tab_node_pool.cc",
     "tab_node_pool.h",
   ]
 
+  public_deps = [
+    "//components/sessions",
+    "//components/sync",
+  ]
+
   deps = [
     "//base",
     "//components/bookmarks/browser",
     "//components/favicon/core",
     "//components/history/core/browser",
     "//components/prefs",
-    "//components/sessions",
-    "//components/sync",
     "//components/variations",
     "//ui/base:base",
     "//ui/gfx",
     "//url",
   ]
 }
 
 static_library("test_support") {
   testonly = true
   sources = [
     "fake_sync_sessions_client.cc",
     "fake_sync_sessions_client.h",
+    "session_sync_test_helper.cc",
+    "session_sync_test_helper.h",
   ]
 
   public_deps = [
     ":sync_sessions",
     "//base",
+    "//components/sync",
+    "//testing/gtest",
     "//url",
   ]
 
   deps = []
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "favicon_cache_unittest.cc",
@@ skipping 19 matching lines @@
     "//components/sessions:test_support",
     "//components/sync",
     "//components/sync:test_support_sync_api",
     "//components/sync:test_support_sync_driver",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base:base",
     "//url",
   ]
 }