changed Run behavior http://code.google.com/p/dart/issues/detail?id=2730,

editor/tools/plugins/com.google.dart.tools.debug.ui/plugin.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <?eclipse version="3.4"?>
 <plugin>
     <extension
          point="org.eclipse.core.expressions.propertyTesters">
       <propertyTester
             class="com.google.dart.tools.debug.ui.launch.RunPropertyTester"
             id="com.google.dart.tools.debug.ui.run.propertyTester"
             namespace="com.google.dart.tools.debug.ui.launch"
             properties="canLaunch"
@@ skipping 251 matching lines @@
    <extension point="org.eclipse.ui.views">
       <view
             class="com.google.dart.tools.debug.ui.internal.view.DebuggerView"
             id="com.google.dart.tools.debug.debuggerView"
             name="Debugger"
             restorable="true"
             category="com.google.dart.tools.ui.dart"
             icon="icons/obj16/debug_exc.gif">
       </view>
    </extension>
-   <extension
-         point="org.eclipse.ui.popupMenus">
-      <viewerContribution
-            id="com.google.dart.tools.debug.ui.viewerContribution"
-            targetID="com.google.dart.tools.ui.LibraryExplorer">
-         <action
-               class="com.google.dart.tools.debug.ui.launch.DartRunAction"
-               enablesFor="1"
-               id="com.google.dart.tools.debug.ui.run.selection"
-               label="Run in Browser"
-               menubarPath="additions">
-         </action>
-         <visibility>
-            <objectState
-                  name="elementType"
-                  value="com.google.dart.tools.core.model.DartElement.HTML_FILE">
-            </objectState>
-         </visibility>
-      </viewerContribution>
-   </extension>
 
    <extension
          point="org.eclipse.core.runtime.adapters">
       <factory
             adaptableType="com.google.dart.tools.core.model.DartElement"
             class="com.google.dart.tools.debug.ui.launch.ActionFilterAdapterFactory">
          <adapter
                type="org.eclipse.ui.IActionFilter">
          </adapter>
       </factory>
@@ skipping 23 matching lines @@
             name="%launchDialogCommandName">
       </command>
    </extension>
    <extension
          point="org.eclipse.ui.menus">
       <menuContribution
             allPopups="true"
             locationURI="popup:com.google.dart.tools.ui.FileExplorer?after=additions">
          <command
                commandId="com.google.dart.tools.debug.ui.run.selection"
+               icon="icons/obj16/run_exc.gif"
                style="push">
             <visibleWhen
                   checkEnabled="false">
                <with
                      variable="selection">
                   <count
                         value="1">
                   </count>
                   <and>
                         <test
                               forcePluginActivation="true"
                               property="com.google.dart.tools.debug.ui.launch.canLaunch">
                         </test>
                   </and>
                </with>
             </visibleWhen>
          </command>
       </menuContribution>
       <menuContribution
             allPopups="false"
             locationURI="menu:org.eclipse.ui.run?after=runGroup">
          <command
-               commandId="com.google.dart.tools.debug.ui.run.last"
+               commandId="com.google.dart.tools.debug.ui.run.selection"
+               icon="icons/obj16/run_exc.gif"
                label="%runCommandName"
                style="push"
                tooltip="%runDescription">
          </command>
-         <command
-               commandId="com.google.dart.tools.debug.ui.run.selection"
-               label="%runSelectionCommandName"
-               style="push"
-               tooltip="%runSelectionDescription">
-         </command>
       </menuContribution>
       <menuContribution
             allPopups="false"
             locationURI="menu:org.eclipse.ui.run?after=emptyLaunchGroup">
          <command
                commandId="com.google.dart.tools.debug.ui.launchDialog"
                style="push">
          </command>
       </menuContribution>
    </extension>
@@ skipping 143 matching lines @@
                icon="icons/full/etool16/run_exc.gif"
                helpContextId="run_action_context"
                label="Run"
                style="pulldown">
          </action>
       </actionSet>
    </extension-->
 
 
 </plugin>