Add Mac support for isolates

tools/bots/dart2js_tests.isolate

Index: tools/bots/dart2js_tests.isolate
diff --git a/tools/bots/dart2js_tests.isolate b/tools/bots/dart2js_tests.isolate
deleted file mode 100644
index f47ead01c9cfa655e96a13f429af2ec84513bb7f..0000000000000000000000000000000000000000
--- a/tools/bots/dart2js_tests.isolate
+++ /dev/null
@@ -1,22 +0,0 @@
-{
-  'variables': {
-    'command': ['tools/test.py'],
-    'files': ['out/ReleaseIA32/dart-sdk/',
-              'out/ReleaseX64/dart-sdk/',
-              'samples/',
-              'samples-dev/',
-              'tools/',
-              'third_party/pkg/',
-              'third_party/pkg_tested/',
-              'third_party/d8/',
-              'third_party/firefox_jsshell/',
-              'tests/',
-              'pkg/async_helper/',
-              'pkg/expect/',
-              'pkg/js/',
-              'pkg/status_file/',
-              'pkg/pkg.status',
-              'runtime/tests/',
-              '.packages']
-  }
-}