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-extension-api/src/main/java/com/google/gerrit/extensions/restapi/RestModifyView.java

@@ -25,13 +25,6 @@ package com.google.gerrit.extensions.restapi;
  * @param <I> type of input the JSON parser will parse the input into.
  */
 public interface RestModifyView<R extends RestResource, I> extends RestView<R> {
-  /**
-   * @return Java class object defining the input type. The JSON parser will
-   *         parse the supplied request body into a new instance of this class
-   *         before passing it to apply.
-   */
-  Class<I> inputType();
-
   /**
    * Process the view operation by altering the resource.
    *