Fix some files in chrome directory for Windows GN build.

chrome/utility/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/crypto.gni")
 import("//build/config/features.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("../chrome_utility.gypi") ],
                           "scope",
@@ skipping 21 matching lines @@
 
   if (!is_android) {
     sources +=
         rebase_path(gypi_values.chrome_utility_importer_sources, ".", "..")
   }
 
   if (enable_extensions) {
     deps += [
       "//chrome/common/extensions/api",
       "//extensions/utility",
-
-      #"//third_party/libexif",  TODO(GYP)
     ]
 
     public_deps += [ "//chrome/common/extensions/api" ]
 
     sources +=
         rebase_path(gypi_values.chrome_utility_extensions_sources, ".", "..")
     sources +=
         rebase_path(gypi_values.chrome_utility_shared_media_sources, ".", "..")
 
     if (is_win || is_mac) {
       sources +=
           rebase_path(gypi_values.chrome_utility_win_mac_media_gallery_sources,
                       ".",
                       "..")
       deps += [ "//components/wifi" ]
     } else {
       sources += [ "image_writer/image_writer_stub.cc" ]
     }
 
     if (is_mac) {
       sources +=
           rebase_path(gypi_values.chrome_utility_mac_media_gallery_sources,
                       ".",
                       "..")
     }
+
+    # Linux should use system libexif
+    if (!is_linux) {
+      # TODO(thestig): Properly support building on Linux and ChromeOS.

[Slava Chigrin, 2015/01/21 10:35:35]

In https://codereview.chromium.org/809343008#msg6 thestig@ said, he will take
care about building libexif on Linux, so I add here this TODO and put this
dependency under if(). At least this will fix some issues on Windows, without
hurting Linux and ChromeOS.

+      deps += [ "//third_party/libexif" ]
+    }
   }
 
   if (use_openssl) {
     if (!is_win && !is_mac && !is_android) {
       sources -= [ "importer/nss_decryptor.cc" ]
     }
   } else {  # !use_openssl
     if (!is_win && !is_mac) {
       sources += [
         "importer/nss_decryptor_system_nss.cc",
@@ skipping 17 matching lines @@
     sources -= [
       "local_discovery/service_discovery_message_handler.cc",
       "local_discovery/service_discovery_message_handler.h",
     ]
   }
 
   if (safe_browsing_mode == 1) {
     defines += [ "FULL_SAFE_BROWSING" ]
   }
 }