Simplify RestModifyView interface

The inputType can be determined by looking at the declaration
of the interface. We don't need to implement a method in each
view implementation to supply the correct data for reflection
in RestApiServlet.

Change-Id: I1afae6ddef661722efe39ccc917c028e7e993595

gerrit-server/src/main/java/com/google/gerrit/server/project/SetDefaultDashboard.java

@@ -55,11 +55,6 @@ class SetDefaultDashboard implements RestModifyView<DashboardResource, Input> {
     this.get = get;
   }
 
-  @Override
-  public Class<Input> inputType() {
-    return Input.class;
-  }
-
   @Override
   public Object apply(DashboardResource resource, Input input)
       throws AuthException, BadRequestException, ResourceConflictException,
@@ -137,11 +132,6 @@ class SetDefaultDashboard implements RestModifyView<DashboardResource, Input> {
       this.setDefault = setDefault;
     }
 
-    @Override
-    public Class<Input> inputType() {
-      return SetDashboard.Input.class;
-    }
-
     @Override
     public Object apply(ProjectResource resource, Input input)
         throws AuthException, BadRequestException, ResourceConflictException,