Refactor the Java AppBannerManager to be owned by native code.

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
index 28547bfbc1c1751139565e3e3d2f1112552c8a49..0bb6f015bdd4f19bdbdc21dcbeac806bf54af6da 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
@@ -10,7 +10,6 @@ import org.chromium.base.ContextUtils;
 import org.chromium.base.library_loader.LibraryProcessType;
 import org.chromium.chrome.browser.ChromeApplication;
 import org.chromium.chrome.browser.ShortcutHelper;
-import org.chromium.chrome.browser.banners.AppBannerManager;
 import org.chromium.chrome.browser.externalnav.ExternalNavigationParams;
 import org.chromium.chrome.browser.tab.InterceptNavigationDelegateImpl;
 import org.chromium.chrome.browser.tab.Tab;
@@ -103,11 +102,11 @@ public class WebApkActivity extends WebappActivity {
             }
 
             @Override
-            public AppBannerManager createAppBannerManager(Tab tab) {
+            public boolean allowAppBanners(Tab tab) {
                 // Do not show app banners for WebAPKs regardless of the current page URL.
                 // A WebAPK can display a page outside of its WebAPK scope if a page within the
                 // WebAPK scope navigates via JavaScript while the WebAPK is in the background.
-                return null;
+                return false;
             }
         };
     }