Add an implementation of url_loader.mojom using OkHttp

third_party/okhttp/LICENSE

Index: third_party/okhttp/LICENSE
diff --git a/third_party/okhttp/LICENSE b/third_party/okhttp/LICENSE
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index 0000000000000000000000000000000000000000..d3270a9de0f4b7262fd026dda2e000fd2103bab3
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+++ b/third_party/okhttp/LICENSE
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+Copyright 2014 Square, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.