Remove deprecated-declarations warnings.

ios/third_party/gcdwebserver/BUILD.gn

Index: ios/third_party/gcdwebserver/BUILD.gn
diff --git a/ios/third_party/gcdwebserver/BUILD.gn b/ios/third_party/gcdwebserver/BUILD.gn
index 4b83fd64a40559960c5b808901d1d76a434b88d3..9f2441c262d36368af94e0017cf2bcdd2c7bbc28 100644
--- a/ios/third_party/gcdwebserver/BUILD.gn
+++ b/ios/third_party/gcdwebserver/BUILD.gn
@@ -17,15 +17,6 @@ config("config") {
   ]
 }
 
-config("private_config") {
-  visibility = [ ":gcdwebserver" ]
-
-  # TODO(crbug.com/569158): Suppresses warnings that are treated as errors

[sdefresne, 2017/05/23 13:13:06]

Please add BUG=569158 to CL description.

-  # when minimum iOS version support is increased to iOS 9 and up.
-  # This should be removed once all deprecation violations have been fixed.
-  cflags = [ "-Wno-error=deprecated-declarations" ]
-}
-
 source_set("gcdwebserver") {
   testonly = true
 
@@ -61,8 +52,5 @@ source_set("gcdwebserver") {
   ]
 
   public_configs = [ ":config" ]
-  configs += [
-    ":private_config",
-    "//build/config/compiler:enable_arc",
-  ]
+  configs += [ "//build/config/compiler:enable_arc" ]
 }