Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/http_parser/README.md

Index: mojo/public/dart/third_party/http_parser/README.md
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+`http_parser` is a platform-independent package for parsing and serializing
+various HTTP-related formats. It's designed to be usable on both the browser and
+the server, and thus avoids referencing any types from `dart:io` or `dart:html`.
+It includes:
+
+* Support for parsing and formatting dates according to [HTTP/1.1][2616], the
+  HTTP/1.1 standard.
+
+* A `MediaType` class that represents an HTTP media type, as used in `Accept`
+  and `Content-Type` headers. This class supports both parsing and formatting
+  media types according to [HTTP/1.1][2616].
+
+* A `CompatibleWebSocket` class that supports both the client and server sides
+  of the [WebSocket protocol][6455] independently of any specific server
+  implementation.
+
+[2616]: http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html
+[6455]: https://tools.ietf.org/html/rfc6455