Discard ChromeViewHostMsg_SearchBox* IPCs if they not sent from an Instant process.

chrome/browser/ui/search/search_ipc_router_policy_impl.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/ui/search/search_ipc_router_policy_impl.h"
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/search.h"
 #include "content/public/browser/web_contents.h"
 
@@ skipping 13 matching lines @@
 
 bool SearchIPCRouterPolicyImpl::ShouldProcessSetVoiceSearchSupport() {
   return true;
 }
 
 bool SearchIPCRouterPolicyImpl::ShouldProcessFocusOmnibox(bool is_active_tab) {
   return is_active_tab && !is_incognito_ && chrome::IsInstantNTP(web_contents_);
 }
 
 bool SearchIPCRouterPolicyImpl::ShouldProcessNavigateToURL(bool is_active_tab) {
-  return is_active_tab && !is_incognito_;
+  return is_active_tab && !is_incognito_ && chrome::IsInstantNTP(web_contents_);
 }
 
 bool SearchIPCRouterPolicyImpl::ShouldProcessDeleteMostVisitedItem() {
   return !is_incognito_ && chrome::IsInstantNTP(web_contents_);
 }
 
 bool SearchIPCRouterPolicyImpl::ShouldProcessUndoMostVisitedDeletion() {
   return !is_incognito_ && chrome::IsInstantNTP(web_contents_);
 }
 
@@ skipping 47 matching lines @@
   return !is_incognito_ && chrome::IsInstantNTP(web_contents_);
 }
 
 bool SearchIPCRouterPolicyImpl::ShouldSendToggleVoiceSearch() {
   return true;
 }
 
 bool SearchIPCRouterPolicyImpl::ShouldSubmitQuery() {
   return true;
 }