Address HandlerLeak lint warnings.

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index f97f467908e0ad2af404f8aed63c22a52cd2777b..f251e467833349e6e079110b2bce0d25253faf22 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -50,6 +50,7 @@ import org.chromium.chrome.browser.NativePage;
 import org.chromium.chrome.browser.SwipeRefreshHandler;
 import org.chromium.chrome.browser.TabState;
 import org.chromium.chrome.browser.TabState.WebContentsState;
+import org.chromium.chrome.browser.TidyHandler;
 import org.chromium.chrome.browser.UrlConstants;
 import org.chromium.chrome.browser.WarmupManager;
 import org.chromium.chrome.browser.WebContentsFactory;
@@ -597,6 +598,21 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
 
     private TopControlsVisibilityDelegate mTopControlsVisibilityDelegate;
 
+    private static class TabEventHandler extends TidyHandler<Tab> {
+
+        public TabEventHandler(Tab instance) {
+            super(instance);
+        }
+
+        @Override
+        public void handleMessage(Message msg, Tab instance) {
+            if (msg == null) return;
+            if (msg.what == MSG_ID_ENABLE_FULLSCREEN_AFTER_LOAD) {
+                instance.enableFullscreenAfterLoad();
+            }
+        }
+    }
+
     /**
      * Creates an instance of a {@link Tab}.
      *
@@ -657,15 +673,7 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
 
         setContentViewClient(new TabContentViewClient());
 
-        mHandler = new Handler() {
-            @Override
-            public void handleMessage(Message msg) {
-                if (msg == null) return;
-                if (msg.what == MSG_ID_ENABLE_FULLSCREEN_AFTER_LOAD) {
-                    enableFullscreenAfterLoad();
-                }
-            }
-        };
+        mHandler = new TabEventHandler(this);
         mTabRedirectHandler = new TabRedirectHandler(mThemedApplicationContext);
         addObserver(mTabObserver);