Rename "install" -> "get" and "update" -> "upgrade".

sdk/lib/_internal/pub/test/unknown_source_test.dart

Index: sdk/lib/_internal/pub/test/unknown_source_test.dart
diff --git a/sdk/lib/_internal/pub/test/unknown_source_test.dart b/sdk/lib/_internal/pub/test/unknown_source_test.dart
index dab714cc0f5a5d98ae8ce20043f22a5af97fac85..d1980834b19c23392ff8c21a1eaa1cd618f37222 100644
--- a/sdk/lib/_internal/pub/test/unknown_source_test.dart
+++ b/sdk/lib/_internal/pub/test/unknown_source_test.dart
@@ -12,7 +12,7 @@ import 'test_pub.dart';
 main() {
   initConfig();
 
-  forBothPubInstallAndUpdate((command) {
+  forBothPubGetAndUpgrade((command) {
     integration('fails gracefully on a dependency from an unknown source', () {
       d.appDir({"foo": {"bad": "foo"}}).create();
 
@@ -63,7 +63,7 @@ main() {
 
       pubCommand(command);
 
-      // Should update to the new one.
+      // Should upgrade to the new one.
       d.dir(packagesPath, [
         d.dir("foo", [
           d.file("foo.dart", 'main() => "foo";')