Removes namespace for removed com.google.gwt.widget

Change-Id: If3bc68f9e7537b24f1a571302b7c166ddf06f583

samples/mobilewebapp/src/main/java/com/google/gwt/sample/mobilewebapp/client/mobile/MobileTaskReadView.ui.xml

diff --git a/samples/mobilewebapp/src/main/java/com/google/gwt/sample/mobilewebapp/client/mobile/MobileTaskReadView.ui.xml b/samples/mobilewebapp/src/main/java/com/google/gwt/sample/mobilewebapp/client/mobile/MobileTaskReadView.ui.xml
index 12f621b..674715f 100644
--- a/samples/mobilewebapp/src/main/java/com/google/gwt/sample/mobilewebapp/client/mobile/MobileTaskReadView.ui.xml
+++ b/samples/mobilewebapp/src/main/java/com/google/gwt/sample/mobilewebapp/client/mobile/MobileTaskReadView.ui.xml
@@ -2,7 +2,6 @@
 <ui:UiBinder
   xmlns:ui="urn:ui:com.google.gwt.uibinder"
   xmlns:g="urn:import:com.google.gwt.user.client.ui"
-  xmlns:w="urn:import:com.google.gwt.widget.client"
   xmlns:app="urn:import:com.google.gwt.sample.mobilewebapp.client.ui">
 
   <ui:style>