Make VoiceSearchTabHelper a purely native object

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

Index: chrome/android/java/src/org/chromium/chrome/browser/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/Tab.java
index cf04a0de78b146efd315524eb3979f62777cf99b..fbe2134ad62b6bccb86a69f3eeefeeb738a2a50c 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/Tab.java
@@ -166,7 +166,6 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
     // Content layer Observers and Delegates
     private ContentViewClient mContentViewClient;
     private WebContentsObserver mWebContentsObserver;
-    private VoiceSearchTabHelper mVoiceSearchTabHelper;
     private TabChromeWebContentsDelegateAndroid mWebContentsDelegate;
     private DomDistillerFeedbackReporter mDomDistillerFeedbackReporter;
 
@@ -1437,7 +1436,6 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
 
         mWebContentsDelegate = createWebContentsDelegate();
         mWebContentsObserver = new TabWebContentsObserver(mContentViewCore.getWebContents());
-        mVoiceSearchTabHelper = new VoiceSearchTabHelper(mContentViewCore.getWebContents());
 
         if (mContentViewClient != null) mContentViewCore.setContentViewClient(mContentViewClient);
 
@@ -1878,11 +1876,6 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
             mWebContentsObserver = null;
         }
 
-        if (mVoiceSearchTabHelper != null) {
-            mVoiceSearchTabHelper.destroy();
-            mVoiceSearchTabHelper = null;
-        }
-
         assert mNativeTabAndroid != 0;
         nativeDestroyWebContents(mNativeTabAndroid, deleteNativeWebContents);
     }