Remove Overflow menu and snackbar when infobar is closing.

chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBar.java

Index: chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBar.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBar.java b/chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBar.java
index 3ad465956a1447102e13a39d83e0babc60a9f787..13a01ffb766fc35e4699ca95b6767b3e48648a10 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBar.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBar.java
@@ -161,6 +161,7 @@ public abstract class InfoBar implements InfoBarView {
             mIsDismissed = true;
             if (!mContainer.hasBeenDestroyed()) {
                 // If the container was destroyed, it's already been emptied of all its infobars.
+                onStartedHiding();
                 mContainer.removeInfoBar(this);
             }
             return true;
@@ -168,6 +169,12 @@ public abstract class InfoBar implements InfoBarView {
         return false;
     }
 
+    /**
+     * Called just before the Java infobar has begun hiding.  Give the chance to clean up any child
+     * UI that may remain open.
+     */
+    protected void onStartedHiding() {}
+
     long getNativeInfoBarPtr() {
         return mNativeInfoBarPtr;
     }