Remove the dependency on json schema compiler.

tools/json_schema_compiler/dart_test/comments.idl

Index: tools/json_schema_compiler/dart_test/comments.idl
diff --git a/tools/json_schema_compiler/dart_test/comments.idl b/tools/json_schema_compiler/dart_test/comments.idl
deleted file mode 100644
index 7ac1474435052cf2761f35561c9bc906840fd850..0000000000000000000000000000000000000000
--- a/tools/json_schema_compiler/dart_test/comments.idl
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This comment is for the comments namespace.
-namespace comments {
-  // This comments the "Functions" block, and should be ignored.
-  interface Functions {
-    // This comment is separated by at least one blank line from the start of
-    // the function, and should be ignored.
-  
-    //
-    // There's a blank line at the start of this comment.
-    //
-    // Documentation for basicFunction.
-    // BasicFunction() is a great function.
-    // There is a newline after this.
-    //
-    // It works like so:
-    //        +-----+
-    //        |     |     +--+
-    //        |     |     |  |
-    //        +-----+ --> +--+
-    //
-    // Some other stuff here.
-    //    This paragraph starts with whitespace.
-    //    Overall, its a great function.
-    // There's also a blank line at the end of this comment.
-    //
-    static void basicFunction();
-  };
-};