GN Windows component build fixes.

components/sessions/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.
 
 if (is_android) {
   import("//build/config/android/config.gni")
 }
 
 # TODO(rohitrao): sessions_core is defined as a source_set because it declares a
 # static function that it does not define.  This prevents it from linking as a
@@ skipping 20 matching lines @@
     "session_types.cc",
     "session_types.h",
   ]
 
   defines = [ "SESSIONS_IMPLEMENTATION" ]
 
   deps = [
     "//base",
     "//skia",
     "//sync",
+    "//sync/protocol",
     "//third_party/protobuf:protobuf_lite",
     "//ui/base",
     "//ui/gfx",
     "//url",
   ]
 }
 
 source_set("test_support") {
   testonly = true
   sources = [
@@ skipping 46 matching lines @@
       "session_types_unittest.cc",
     ]
     deps = [
       ":sessions_content",
       "//base/test:test_support",
       "//testing/gtest",
       "//third_party/protobuf:protobuf_lite",
     ]
   }
 }