Remove the gn target //build/linux:fontconfig in favor of //third_party/fontconfig.

Review-Url: https://codereview.chromium.org/2923973004
Cr-Commit-Position: refs/heads/master@{#478106}
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 0feb321..f8fb33c 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -3829,7 +3829,7 @@
 
   if (is_linux) {
     if (use_aura) {
-      deps += [ "//build/linux:fontconfig" ]
+      deps += [ "//third_party/fontconfig" ]
       if (use_dbus) {
         deps += [ "//dbus" ]
       }