Properly update git binary snapshots during pub upgrade.

sdk/lib/_internal/pub_generated/test/snapshot/updates_snapshot_for_git_dependency_test.dart

Index: sdk/lib/_internal/pub_generated/test/snapshot/updates_snapshot_for_git_dependency_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/snapshot/upgrades_snapshot_test.dart b/sdk/lib/_internal/pub_generated/test/snapshot/updates_snapshot_for_git_dependency_test.dart
similarity index 53%
copy from sdk/lib/_internal/pub_generated/test/snapshot/upgrades_snapshot_test.dart
copy to sdk/lib/_internal/pub_generated/test/snapshot/updates_snapshot_for_git_dependency_test.dart
index bd8150f11b83dd42bf24f7a0fa4b4e2c409b5d47..b370c807e129b4c57da488416e4bd13d4081d66c 100644
--- a/sdk/lib/_internal/pub_generated/test/snapshot/upgrades_snapshot_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/snapshot/updates_snapshot_for_git_dependency_test.dart
@@ -12,41 +12,44 @@ import '../test_pub.dart';
 
 main() {
   initConfig();
-  integration("upgrades a snapshot when its package is upgraded", () {
-    servePackages((builder) {
-      builder.serve(
-          "foo",
-          "1.2.3",
-          contents: [
-              d.dir("bin", [d.file("hello.dart", "void main() => print('hello!');")])]);
-    });
+  integration("upgrades a snapshot when a git dependency is upgraded", () {
+    ensureGit();
+
+    d.git('foo.git', [d.pubspec({
+        "name": "foo",
+        "version": "0.0.1"
+      }),
+          d.dir(
+              "bin",
+              [d.file("hello.dart", "void main() => print('Hello!');")])]).create();
 
     d.appDir({
-      "foo": "any"
+      "foo": {
+        "git": "../foo.git"
+      }
     }).create();
 
     pubGet(output: contains("Precompiled foo:hello."));
 
     d.dir(
         p.join(appPath, '.pub', 'bin', 'foo'),
-        [d.matcherFile('hello.dart.snapshot', contains('hello!'))]).validate();
+        [d.matcherFile('hello.dart.snapshot', contains('Hello!'))]).validate();
 
-    servePackages((builder) {
-      builder.serve(
-          "foo",
-          "1.2.4",
-          contents: [
-              d.dir("bin", [d.file("hello.dart", "void main() => print('hello 2!');")])]);
-    });
+    d.git(
+        'foo.git',
+        [
+            d.dir(
+                "bin",
+                [d.file("hello.dart", "void main() => print('Goodbye!');")])]).commit();
 
     pubUpgrade(output: contains("Precompiled foo:hello."));
 
     d.dir(
         p.join(appPath, '.pub', 'bin', 'foo'),
-        [d.matcherFile('hello.dart.snapshot', contains('hello 2!'))]).validate();
+        [d.matcherFile('hello.dart.snapshot', contains('Goodbye!'))]).validate();
 
     var process = pubRun(args: ['foo:hello']);
-    process.stdout.expect("hello 2!");
+    process.stdout.expect("Goodbye!");
     process.shouldExit();
   });
 }