Remove dependency on http package

BUG=

Review URL: https://codereview.appspot.com/243950044

pkgs/package_config/lib/discovery.dart

diff --git a/pkgs/package_config/lib/discovery.dart b/pkgs/package_config/lib/discovery.dart
index f8e45d4..0dd7f55 100644
--- a/pkgs/package_config/lib/discovery.dart
+++ b/pkgs/package_config/lib/discovery.dart
@@ -5,9 +5,11 @@
 library package_config.discovery;
 
 import "dart:async";
-import "dart:io" show Directory, File, FileSystemEntity;
+import "dart:io";
+import "dart:typed_data" show Uint8List;
+
 import "package:path/path.dart" as path;
-import "package:http/http.dart" as http;
+
 import "packages.dart";
 import "packages_file.dart" as pkgfile show parse;
 import "src/packages_impl.dart";
@@ -39,8 +41,7 @@
 /// It must return the *contents* of the file identified by the URI it's given,
 /// which should be a UTF-8 encoded `.packages` file, and must return an
 /// error future if loading fails for any reason.
-Future<Packages> findPackages(
-    Uri baseUri,
+Future<Packages> findPackages(Uri baseUri,
     {Future<List<int>> loader(Uri unsupportedUri)}) {
   if (baseUri.scheme == "file") {
     return new Future<Packages>.sync(() => findPackagesFromFile(baseUri));
@@ -113,8 +114,8 @@
   if (location == null) return Packages.noPackages;
   if (location is File) {
     List<int> fileBytes = location.readAsBytesSync();
-    Map<String, Uri> map = pkgfile.parse(fileBytes,
-                                         new Uri.file(location.path));
+    Map<String, Uri> map =
+        pkgfile.parse(fileBytes, new Uri.file(location.path));
     return new MapPackages(map);
   }
   assert(location is Directory);
@@ -139,7 +140,7 @@
 /// of the requested `.packages` file as bytes, which will be assumed to be
 /// UTF-8 encoded.
 Future<Packages> findPackagesFromNonFile(Uri nonFileUri,
-                                         {Future<List<int>> loader(Uri name)}) {
+    {Future<List<int>> loader(Uri name)}) {
   if (loader == null) loader = _httpGet;
   Uri packagesFileUri = nonFileUri.resolve(".packages");
   return loader(packagesFileUri).then((List<int> fileBytes) {
@@ -152,10 +153,29 @@
   });
 }
 
-/// Fetches a file using the http library.
+/// Fetches a file over http.
 Future<List<int>> _httpGet(Uri uri) {
-  return http.get(uri).then((http.Response response) {
-    if (response.statusCode == 200) return response.bodyBytes;
-    throw 0;  // The error message isn't being used for anything.
+  HttpClient client = new HttpClient();
+  return client
+      .getUrl(uri)
+      .then((HttpClientRequest request) => request.close())
+      .then((HttpClientResponse response) {
+    if (response.statusCode != HttpStatus.OK) {
+      String msg = 'Failure getting $uri: '
+          '${response.statusCode} ${response.reasonPhrase}';
+      throw msg;
+    }
+    return response.toList();
+  }).then((List<List<int>> splitContent) {
+    int totalLength = splitContent.fold(0, (int old, List list) {
+      return old + list.length;
+    });
+    Uint8List result = new Uint8List(totalLength);
+    int offset = 0;
+    for (List<int> contentPart in splitContent) {
+      result.setRange(offset, offset + contentPart.length, contentPart);
+      offset += contentPart.length;
+    }
+    return result;
   });
 }

pkgs/package_config/pubspec.lock

diff --git a/pkgs/package_config/pubspec.lock b/pkgs/package_config/pubspec.lock
index 708d891..5cae005 100644
--- a/pkgs/package_config/pubspec.lock
+++ b/pkgs/package_config/pubspec.lock
@@ -25,10 +25,6 @@
     description: crypto
     source: hosted
     version: "0.9.0"
-  http:
-    description: http
-    source: hosted
-    version: "0.11.2"
   http_parser:
     description: http_parser
     source: hosted

pkgs/package_config/pubspec.yaml

diff --git a/pkgs/package_config/pubspec.yaml b/pkgs/package_config/pubspec.yaml
index 338aab5..5eca330 100644
--- a/pkgs/package_config/pubspec.yaml
+++ b/pkgs/package_config/pubspec.yaml
@@ -1,5 +1,5 @@
 name: package_config
-version: 0.0.3
+version: 0.0.3+1
 description: Support for working with Package Resolution config files.
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/package_config
@@ -9,7 +9,6 @@
 
 dependencies:
   charcode: '^1.1.0'
-  http: '^0.11.0'
   path: '>=1.0.0 <2.0.0'
 
 dev_dependencies: