Fix some files in chrome directory for Windows GN build.

chrome/utility/BUILD.gn

Index: chrome/utility/BUILD.gn
diff --git a/chrome/utility/BUILD.gn b/chrome/utility/BUILD.gn
index fed82f85a4dd2f99dae8397f2f1908fcd1d9492d..a4ca50e18e41c4eef0629517d4b35e53fb80edb4 100644
--- a/chrome/utility/BUILD.gn
+++ b/chrome/utility/BUILD.gn
@@ -39,8 +39,6 @@ static_library("utility") {
     deps += [
       "//chrome/common/extensions/api",
       "//extensions/utility",
-
-      #"//third_party/libexif",  TODO(GYP)
     ]
 
     public_deps += [ "//chrome/common/extensions/api" ]
@@ -66,6 +64,12 @@ static_library("utility") {
                       ".",
                       "..")
     }
+
+    # 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) {