Use fake media stream in ContentPreferencesTest#testCameraMicNotBlocked

chrome/android/javatests/src/org/chromium/chrome/browser/preferences/website/ContentPreferencesTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/preferences/website/ContentPreferencesTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/preferences/website/ContentPreferencesTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/preferences/website/ContentPreferencesTest.java
index cd1e3649ccd3c84a5deb7907c82faf03ca9dbea2..5ee98a88b04fc6ecd715c0ac3c9410af54d0e19a 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/preferences/website/ContentPreferencesTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/preferences/website/ContentPreferencesTest.java
@@ -9,7 +9,9 @@ import android.os.Bundle;
 import android.test.suitebuilder.annotation.SmallTest;
 
 import org.chromium.base.ThreadUtils;
+import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.Feature;
+import org.chromium.chrome.ChromeSwitches;
 import org.chromium.chrome.browser.infobar.InfoBar;
 import org.chromium.chrome.browser.infobar.InfoBarContainer;
 import org.chromium.chrome.browser.location.LocationSettingsTestUtil;
@@ -319,6 +321,7 @@ public class ContentPreferencesTest extends ChromeShellTestBase {
      */
     @SmallTest
     @Feature({"Preferences"})
+    @CommandLineFlags.Add(ChromeSwitches.USE_FAKE_DEVICE_FOR_MEDIA_STREAM)
     public void testCameraMicNotBlocked() throws Exception {
         setEnableCameraMic(true);