Increase the CCT module API version to 9

This is possible because the implementation of the postMessage API was completed in
https://chromium-review.googlesource.com/c/chromium/src/+/1323669.

Bug: 898840
Change-Id: Ib3bfc9a9be1ea70be760204715b86ea8053e9ea8
Reviewed-on: https://chromium-review.googlesource.com/c/1406686Reviewed-by: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
Commit-Queue: David Barker <barkerd@google.com>
Cr-Commit-Position: refs/heads/master@{#622064}

chrome/android/java/src/org/chromium/chrome/browser/customtabs/dynamicmodule/ModuleHostImpl.java

@@ -10,7 +10,7 @@ import android.content.Context;
  * The implementation of {@link IModuleHost}.
  */
 public class ModuleHostImpl extends BaseModuleHost {
-    private static final int VERSION = 8;
+    private static final int VERSION = 9;
     private static final int MINIMUM_MODULE_VERSION = 1;
 
     private final Context mApplicationContext;