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

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

Index: mojo/public/dart/third_party/http_parser/CHANGELOG.md
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+## 1.0.0
+
+This is 1.0.0 because the API is stable—there are no breaking changes.
+
+* Added an `AuthenticationChallenge` class for parsing and representing the
+  value of `WWW-Authenticate` and related headers.
+
+* Added a `CaseInsensitiveMap` class for representing case-insensitive HTTP
+  values.
+
+## 0.0.2+8
+
+* Bring in the latest `dart:io` WebSocket code.
+
+## 0.0.2+7
+
+* Add more detail to the readme.
+
+## 0.0.2+6
+
+* Updated homepage URL.
+
+## 0.0.2+5
+
+* Widen the version constraint on the `collection` package.
+
+## 0.0.2+4
+
+* Widen the `string_scanner` version constraint.
+
+## 0.0.2+3
+
+* Fix a library name conflict.
+
+## 0.0.2+2
+
+* Fixes for HTTP date formatting.
+
+## 0.0.2+1
+
+* Minor code refactoring.
+
+## 0.0.2
+
+* Added `CompatibleWebSocket`, for platform- and API-independent support for the
+  WebSocket API.