Renderer initiated navigations from non instant process should not fall into instant.

chrome/browser/search/search.cc

 // Copyright 2012 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/search/search.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
@@ skipping 479 matching lines @@
     return GetBoolValueForFlagWithDefault(kLocalNTPFlagName, false, flags);
   }
 
   return false;
 }
 
 bool MatchesOriginAndPath(const GURL& my_url, const GURL& other_url) {
   return MatchesOrigin(my_url, other_url) && my_url.path() == other_url.path();
 }
 
+GURL GetPrivilegedURLForInstant(const GURL& url, Profile* profile) {
+  CHECK(ShouldAssignURLToInstantRenderer(url, profile))
+      << "Error granting Instant access.";
+
+  if (IsPrivilegedURLForInstant(url))
+    return url;
+
+  GURL privileged_url(url);
+
+  // Replace the scheme with "chrome-search:".
+  url_canon::Replacements<char> replacements;
+  std::string search_scheme(chrome::kChromeSearchScheme);
+  replacements.SetScheme(search_scheme.data(),
+                         url_parse::Component(0, search_scheme.length()));
+  privileged_url = privileged_url.ReplaceComponents(replacements);
+  return privileged_url;
+}
+
+bool IsPrivilegedURLForInstant(const GURL& url) {
+  return url.SchemeIs(chrome::kChromeSearchScheme);
+}
+
 void EnableInstantExtendedAPIForTesting() {
   CommandLine* cl = CommandLine::ForCurrentProcess();
   cl->AppendSwitch(switches::kEnableInstantExtendedAPI);
 }
 
 bool GetFieldTrialInfo(const std::string& group_name,
                        FieldTrialFlags* flags,
                        uint64* group_number) {
   if (EndsWith(group_name, kDisablingSuffix, true) ||
       !StartsWithASCII(group_name, kGroupNumberPrefix, true))
@@ skipping 90 matching lines @@
 
   GURL instant_url = TemplateURLRefToGURL(template_url->instant_url_ref(),
                                           kDisableStartMargin);
   // Extended mode instant requires a search terms replacement key.
   return instant_url.is_valid() &&
          (!IsInstantExtendedAPIEnabled() ||
           template_url->HasSearchTermsReplacementKey(instant_url));
 }
 
 }  // namespace chrome