Disable learning text suggestions if in incognito.

chrome/android/java/src/org/chromium/chrome/browser/omnibox/LocationBarLayout.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.omnibox;
 
 import static org.chromium.chrome.browser.toolbar.ToolbarPhone.URL_FOCUS_CHANGE_ANIMATION_DURATION_MS;
 
 import android.Manifest;
 import android.animation.Animator;
@@ skipping 2231 matching lines @@
      * Update the location bar visuals based on a loading state change.
      * @param updateUrl Whether to update the URL as a result of the this call.
      */
     @Override
     public void updateLoadingState(boolean updateUrl) {
         if (updateUrl) setUrlToPageUrl();
         updateNavigationButton();
         updateSecurityIcon(getSecurityLevel());
     }
 
-    /**
-     * @return The Tab currently showing.
-     */
     @Override
     public Tab getCurrentTab() {
         if (mToolbarDataProvider == null) return null;
         return mToolbarDataProvider.getTab();
     }
 
+    @Override
+    public boolean allowKeyboardLearning() {
+        if (mToolbarDataProvider == null) return false;
+        return !mToolbarDataProvider.isIncognito();
+    }
+
     private void initOmniboxResultsContainer() {
         if (mOmniboxResultsContainer != null) return;
 
         // Use the omnibox results container in the bottom sheet if it exists.
         int omniboxResultsContainerId = R.id.omnibox_results_container_stub;
         if (mBottomSheet != null) {
             omniboxResultsContainerId = R.id.bottom_omnibox_results_container_stub;
         }
 
         ViewStub overlayStub = (ViewStub) getRootView().findViewById(omniboxResultsContainerId);
@@ skipping 254 matching lines @@
     public void setTitleToPageTitle() { }
 
     @Override
     public void setShowTitle(boolean showTitle) { }
 
     @Override
     public boolean mustQueryUrlBarLocationForSuggestions() {
         return DeviceFormFactor.isTablet();
     }
 }