Fix crash when set VR mode to false after VrShell is destroyed

chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrClassesWrapperImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrClassesWrapperImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrClassesBuilderImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrClassesWrapperImpl.java
similarity index 83%
rename from chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrClassesBuilderImpl.java
rename to chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrClassesWrapperImpl.java
index 067749b5ba56c11a87ff12b8b1a22f3270a552b9..5c2334668157e0de1c6988ce1194a461481cfda7 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrClassesBuilderImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrClassesWrapperImpl.java
@@ -7,6 +7,8 @@ package org.chromium.chrome.browser.vr_shell;
 import android.app.Activity;
 import android.os.StrictMode;
 
+import com.google.vr.ndk.base.AndroidCompat;
+
 import org.chromium.base.Log;
 import org.chromium.base.annotations.UsedByReflection;
 
@@ -15,12 +17,12 @@ import org.chromium.base.annotations.UsedByReflection;
  * flag as this class. So no reflection is necessary when create them.
  */
 @UsedByReflection("VrShellDelegate.java")
-public class VrClassesBuilderImpl implements VrClassesBuilder {
-    private static final String TAG = "VrClassesBuilderImpl";
+public class VrClassesWrapperImpl implements VrClassesWrapper {
+    private static final String TAG = "VrClassesWrapperImpl";
     private final Activity mActivity;
 
     @UsedByReflection("VrShellDelegate.java")
-    public VrClassesBuilderImpl(Activity activity) {
+    public VrClassesWrapperImpl(Activity activity) {
         mActivity = activity;
     }
 
@@ -59,4 +61,9 @@ public class VrClassesBuilderImpl implements VrClassesBuilder {
     public VrCoreVersionChecker createVrCoreVersionChecker() {
         return new VrCoreVersionCheckerImpl();
     }
+
+    @Override
+    public void setVrModeEnabled(boolean enabled) {
+        AndroidCompat.setVrModeEnabled(mActivity, enabled);
+    }
 }