[VrShell] FullscreenActivity is not supported when in VR.

chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java
index faea5d938c9faa204b26b3abd577c0ee95e04768..7e1b9d65f616b0756d2ca662ca2e662fe4a70856 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java
@@ -2162,6 +2162,6 @@ public class ChromeTabbedActivity extends ChromeActivity implements OverviewMode
 
     @Override
     public boolean supportsFullscreenActivity() {
-        return true;
+        return !VrShellDelegate.isInVr();
     }
 }