Disable WebAPK updates when "installation from unknown sources" is disabled

chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebApkUpdateManagerTest.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebApkUpdateManagerTest.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebApkUpdateManagerTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebApkUpdateManagerTest.java
index 9ba78ec5985e99f0015c2d807e11db7c48ff0ba1..1b6128bc2e9b9c64a1733fec19370cac0ae7ce92 100644
--- a/chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebApkUpdateManagerTest.java
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebApkUpdateManagerTest.java
@@ -12,6 +12,7 @@ import static org.chromium.chrome.browser.webapps.ManifestUpgradeDetector.Fetche
 
 import android.graphics.Bitmap;
 import android.os.Bundle;
+import android.provider.Settings;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -202,6 +203,9 @@ public class WebApkUpdateManagerTest {
         ContextUtils.initApplicationContextForTests(RuntimeEnvironment.application);
         CommandLine.init(null);
 
+        Settings.Secure.putInt(RuntimeEnvironment.application.getContentResolver(),
+                Settings.Secure.INSTALL_NON_MARKET_APPS, 1);
+
         mClock = new MockClock();
         WebappDataStorage.setClockForTests(mClock);