Upstream "nsurl_util.{h,mm}" from Chrome on iOS repository.

net/net.gyp

Index: net/net.gyp
diff --git a/net/net.gyp b/net/net.gyp
index 6f264fb867491b9c914c4e29f8a248a2a20b183c..655c83c47532a9ec248a2f17b1c6cbd53c3b74b6 100644
--- a/net/net.gyp
+++ b/net/net.gyp
@@ -442,6 +442,12 @@
             },
           },
         ],
+        [ 'OS == "ios" or OS == "mac"', {
+            'sources': [
+              '<@(net_base_mac_ios_sources)',
+            ],
+          },
+        ],
         ['OS=="android" and _toolset=="target" and android_webview_build == 0', {
           'dependencies': [
              'net_java',
@@ -546,6 +552,11 @@
             '<@(net_linux_test_sources)',
           ],
         }],
+        ['OS == "mac" or OS == "ios"', {
+          'sources': [
+            '<@(net_base_test_mac_ios_sources)',
+          ],
+        }],
         ['chromeos==1', {
           'sources!': [
             'proxy/proxy_config_service_linux_unittest.cc',