📺 Move fullscreen web content to a new Activity.

chrome/android/java/src/org/chromium/chrome/browser/tabmodel/SingleTabModel.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tabmodel/SingleTabModel.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/SingleTabModel.java b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/SingleTabModel.java
index d9329ab9d11af5764b98d44ac14a32c6682428cb..8f67d04ac799cef6d0af0f9773eef8b28a432fe3 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/SingleTabModel.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/SingleTabModel.java
@@ -18,7 +18,7 @@ import org.chromium.chrome.browser.tab.Tab;
  */
 public class SingleTabModel implements TabModel {
     private final Activity mActivity;
-    private final ObserverList<TabModelObserver> mObservers = new ObserverList<TabModelObserver>();
+    private final ObserverList<TabModelObserver> mObservers = new ObserverList<>();
 
     private Tab mTab;
     private boolean mIsIncognito;
@@ -169,11 +169,14 @@ public class SingleTabModel implements TabModel {
 
     @Override
     public void addTab(Tab tab, int index, TabLaunchType type) {
+        mTab = tab;
     }
 
     @Override
     public void removeTab(Tab tab) {
-        assert false;
+        mTab = null;
+
+        for (TabModelObserver obs : mObservers) obs.tabRemoved(tab);
     }
 
     @Override