Remove untrusted sources installation flow.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/ChromeWebApkHost.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/ChromeWebApkHost.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/ChromeWebApkHost.java
index 3ca4a81dc52613c0a44094481c4d388412375046..86ff686797bec2bcf119e30a2d63749e0d8274a0 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/ChromeWebApkHost.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/ChromeWebApkHost.java
@@ -4,9 +4,7 @@
 
 package org.chromium.chrome.browser.webapps;
 
-import android.content.Context;
 import android.os.StrictMode;
-import android.provider.Settings;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.base.Log;
@@ -37,6 +35,8 @@ public class ChromeWebApkHost {
 
     public static void initForTesting(boolean enabled) {
         sEnabledForTesting = enabled;
+        sGooglePlayInstallState = enabled ? GooglePlayInstallState.SUPPORTED
+                                          : GooglePlayInstallState.NO_PLAY_SERVICES;
     }
 
     public static boolean isEnabled() {
@@ -47,13 +47,7 @@ public class ChromeWebApkHost {
 
     // Returns whether updating the WebAPK is enabled.
     public static boolean areUpdatesEnabled() {
-        if (!isEnabled()) return false;
-
-        // Updating a WebAPK without going through Google Play requires "installation from unknown
-        // sources" to be enabled. It is confusing for a user to see a dialog asking them to enable
-        // "installation from unknown sources" when they are in the middle of using the WebAPK (as
-        // opposed to after requesting to add a WebAPK to the homescreen).
-        return installingFromUnknownSourcesAllowed() || canUseGooglePlayToInstallWebApk();
+        return canInstallWebApk();
     }
 
     /** Computes the GooglePlayInstallState. */
@@ -73,23 +67,10 @@ public class ChromeWebApkHost {
         return GooglePlayInstallState.SUPPORTED;
     }
 
-    /**
-     * Returns whether installing WebAPKs from Google Play is possible.
-     * If {@link sCanUseGooglePlayInstall} hasn't been set yet, it returns false immediately and
-     * calls the Google Play Install API to update {@link sCanUseGooglePlayInstall} asynchronously.
-     */
-    private static boolean canUseGooglePlayToInstallWebApk() {
-        return getGooglePlayInstallState() == GooglePlayInstallState.SUPPORTED;
-    }
-
-    /**
-     * Returns whether installing WebAPKs is possible either from "unknown resources" or Google
-     * Play.
-     */
+    /** Returns whether installing WebAPKs is possible. */
     @CalledByNative
     private static boolean canInstallWebApk() {
-        return isEnabled()
-                && (canUseGooglePlayToInstallWebApk() || nativeCanInstallFromUnknownSources());
+        return isEnabled() && getGooglePlayInstallState() == GooglePlayInstallState.SUPPORTED;
     }
 
     @CalledByNative
@@ -136,21 +117,5 @@ public class ChromeWebApkHost {
         }
     }
 
-    /**
-     * Returns whether the user has enabled installing apps from sources other than the Google Play
-     * Store.
-     */
-    private static boolean installingFromUnknownSourcesAllowed() {
-        Context applicationContext = ContextUtils.getApplicationContext();
-        try {
-            return Settings.Secure.getInt(applicationContext.getContentResolver(),
-                           Settings.Secure.INSTALL_NON_MARKET_APPS)
-                    == 1;
-        } catch (Settings.SettingNotFoundException e) {
-            return false;
-        }
-    }
-
     private static native boolean nativeCanLaunchRendererInWebApkProcess();
-    private static native boolean nativeCanInstallFromUnknownSources();
 }