Upgrade to Polymer 0.10.0-pre.13

runtime/bin/vmservice/client/HACKING.txt

 Dart Observatory Developer Guide
 ---
 
 Assumptions:
 You are running pub from the latest dev channel release of Dart Editor.
 
 During development you do not need to run dart2js or rebuild the VM (unless
 you are also making changes to the backend). While you're working on your
 feature follow the steps:
 
 1. Open runtime/bin/vmservice/client in the Dart Editor
 2. Run pub upgrade
-3. Run pub serve in runtime/bin/vmservice/client
-4. Launch dart --enable-vm-service --pause-isolates-on-exit script.dart
-5. Connect to http://localhost:8080 in Dartium.
+3. Run dart --enable-vm-service --pause-isolates-on-exit script.dart
+4. Run index.html in Dartium
 
 At this point you should see the initial Observatory UI and that
-it is communicating with the VM you launched in step 4.
+it is communicating with the VM you launched in step 3.
 
 Continue to develop and iterate until you're ready to upload your change
 for review. Upload your change and get an LGTM.
 
-6. Run pub build
-7. Run ./deploy.sh
+5. Run pub build
+6. Run ./deploy.sh
 
 At this point you should rebuild your VM and:
 
-8. Launch dart --enable-vm-service --pause-isolates-on-exit script.dart
+7. Launch dart --enable-vm-service --pause-isolates-on-exit script.dart
 
 In a non-Dart enabled browser navigate to localhost:8181 and ensure
 that your feature works after being compiled to JavaScript.
 
-9. Commit your change
+8. Commit your change