[Android WebAPK] Add UMA histogram to record error code when install fails pt 2/3

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

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java
index 7de2c2403bec3982e00e2728941270eaa7f9ccf9..c19430a28dc338745e67e537b8b6da5e16959b7b 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java
@@ -4,33 +4,12 @@
 
 package org.chromium.chrome.browser.webapps;
 
-import android.support.annotation.IntDef;
-
 import org.chromium.base.Callback;
 
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-
 /**
  * Defines an interface for installing WebAPKs via Google Play.
  */
 public interface GooglePlayWebApkInstallDelegate {
-    /**
-     * The app state transitions provided by Google Play during download and installation process.
-     */
-    @Retention(RetentionPolicy.SOURCE)
-    @IntDef({INVALID, DOWNLOAD_PENDING, DOWNLOADING, DOWNLOAD_CANCELLED, DOWNLOAD_ERROR,
-             INSTALLING, INSTALL_ERROR, INSTALLED})
-    public @interface InstallerPackageEvent {}
-    public static final int INVALID = -1;
-    public static final int DOWNLOAD_PENDING = 0;
-    public static final int DOWNLOADING = 1;
-    public static final int DOWNLOAD_CANCELLED = 2;
-    public static final int DOWNLOAD_ERROR = 3;
-    public static final int INSTALLING = 4;
-    public static final int INSTALL_ERROR = 5;
-    public static final int INSTALLED = 6;
-
     /**
      * Uses Google Play to install WebAPK asynchronously.
      * @param packageName The package name of WebAPK to install.
@@ -54,10 +33,4 @@ public interface GooglePlayWebApkInstallDelegate {
      */
     void updateAsync(String packageName, int version, String title, String token, String url,
             Callback<Integer> callback);
-    /**
-     * Calls the callback once the installation either succeeded or failed.
-     * @param packageName The package name of WebAPK for the installation.
-     * @param event The result of the install.
-     */
-    void onGotInstallEvent(String packageName, @InstallerPackageEvent int event);
 }