Bump GWT to 2.7.0

Change-Id: Ibbebf86b42992ca300524f2c1f08db10028f63c3
diff --git a/pom.xml b/pom.xml
index 4a11b32..6c342c4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -73,7 +73,7 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>gwt-maven-plugin</artifactId>
-        <version>2.6.1</version>
+        <version>2.7.0</version>
         <configuration>
           <module>com.googlesource.gerrit.plugins.serviceuser.CreateServiceUserForm</module>
           <disableClassMetadata>true</disableClassMetadata>
@@ -108,7 +108,7 @@
     <dependency>
       <groupId>com.google.gwt</groupId>
       <artifactId>gwt-user</artifactId>
-      <version>2.6.1</version>
+      <version>2.7.0</version>
       <scope>provided</scope>
     </dependency>
   </dependencies>