Fix remaining uses of Directory.systemTemp outside test scripts.

BUG=
R=sgjesse@google.com

Review URL: https://codereview.chromium.org//25666015

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28576 260f80e4-7a28-3924-810f-c04153c831b5

sdk/lib/core/object.dart

@@ -78,7 +78,7 @@ class Object {
   external String toString();
 
   /**
-   * [noSuchMethod] is invoked when users invoke a non-existant method
+   * [noSuchMethod] is invoked when users invoke a non-existent method
    * on an object. The name of the method and the arguments of the
    * invocation are passed to [noSuchMethod] in an [Invocation].
    * If [noSuchMethod] returns a value, that value becomes the result of

tests/standalone/io/file_fuzz_test.dart

@@ -88,7 +88,6 @@ fuzzSyncRandomAccessMethods() {
 }
 
 fuzzAsyncRandomAccessMethods() {
-  var d = new Directory('');
   var temp = Directory.systemTemp.createTempSync('dart_file_fuzz');
   var file = new File('${temp.path}/x');
   file.createSync();