WebContentsObserver update for PlzNavigate methods

chrome/android/java/src/org/chromium/chrome/browser/customtabs/PostMessageHandler.java

Index: chrome/android/java/src/org/chromium/chrome/browser/customtabs/PostMessageHandler.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/PostMessageHandler.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/PostMessageHandler.java
index 4013ac46f01d0a029777bc470a076e19e55ebe57..702b8422bf6143232b439a3793da478da6fecf05 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/PostMessageHandler.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/PostMessageHandler.java
@@ -68,9 +68,9 @@ public class PostMessageHandler {
             private boolean mNavigatedOnce;
 
             @Override
-            public void didNavigateMainFrame(String url, String baseUrl,
-                    boolean isNavigationToDifferentPage, boolean isFragmentNavigation,
-                    int statusCode) {
+            public void didFinishNavigation(String validatedUrl, boolean isMainFrame,
+                    boolean isErrorPage, boolean hasCommitted, boolean isNavigationToDifferentPage,
+                    boolean isFragmentNavigation, boolean isReload) {
                 if (mNavigatedOnce && isNavigationToDifferentPage && mChannel != null) {
                     mChannel[0].close();
                     mChannel = null;