get rid of dependency on htmlconverter for everything but swarm.

samples/isolate_html/README

Index: samples/isolate_html/README
===================================================================
--- samples/isolate_html/README	(revision 6168)
+++ samples/isolate_html/README	(working copy)
@@ -12,9 +12,12 @@
 2. build the dartc compiler:
   $ ./tools/build.py --arch=ia32
 
-3. run the htmlconverter tool, that converts the dart code to javascript:
-  $ python ./client/tools/htmlconverter.py \
-    client/samples/isolate/isolate_sample.html -o out/
+3. either compile the Dart code to JavaScript, or load the code directly into
+   Dartium:
 
-4. open the generated file in a browser:
-  $ google-chrome out/client/samples/isolate/isolate_sample-js.html
+   - to compile the code:
+     $(DART_SDK)/bin/frogc --out=isolate_sample.dart.js isolate_sample.dart
+
+4. open the generated file in a browser (either Dartium, Chrome, or another
+   supported browser):
+  $ google-chrome isolate_sample.html