VR: Don't unregister Daydream intent when leaving webVR page if browsing is supported.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellDelegate.java
index 4debec59ab4641db031e49bea713768e971c1777..27d466a996eea8e04775d78d532b83343c301780 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellDelegate.java
@@ -880,7 +880,8 @@ public class VrShellDelegate implements ApplicationStatus.ActivityStateListener,
         // mListeningForWebVrActivate for them.
         if (mVrSupportLevel != VR_DAYDREAM) return;
         mListeningForWebVrActivate = listening;
-        if (listening && !mPaused) {
+        if (mPaused) return;
+        if (listening) {
             registerDaydreamIntent(mVrDaydreamApi, mActivity);
             if (mAutopresentWebVr) {
                 // Dispatch vrdisplayactivate so that the WebVr page can call requestPresent
@@ -890,7 +891,7 @@ public class VrShellDelegate implements ApplicationStatus.ActivityStateListener,
                 // UI which is suboptimal.
                 nativeDisplayActivate(mNativeVrShellDelegate);
             }
-        } else {
+        } else if (!canEnterVr(mActivity.getActivityTab())) {
             unregisterDaydreamIntent(mVrDaydreamApi);
         }
     }