Remove call to IsInstantExtendedAPIGoogleSearchUrl from SearchTabHelper.

This patch ensures SearchTabHelper no longer relies on the hardcoded "espv" parameter.

Depends on:
  https://codereview.chromium.org/11552020/
  https://codereview.chromium.org/11576044/

BUG=161602

Review URL: https://chromiumcodereview.appspot.com/11585008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175910 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/search/search_tab_helper.cc

@@ -6,6 +6,9 @@
 
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/search_engines/template_url.h"
+#include "chrome/browser/search_engines/template_url_service.h"
+#include "chrome/browser/search_engines/template_url_service_factory.h"
 #include "chrome/browser/ui/search/search.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/navigation_controller.h"
@@ -24,12 +27,31 @@ bool IsNTP(const GURL& url) {
          url.host() == chrome::kChromeUINewTabHost;
 }
 
-bool IsSearchEnabled(content::WebContents* web_contents) {
-  Profile* profile =
-      Profile::FromBrowserContext(web_contents->GetBrowserContext());
+Profile* ProfileFromWebContents(const content::WebContents* web_contents) {
+  return Profile::FromBrowserContext(web_contents->GetBrowserContext());
+}
+
+bool IsSearchEnabled(Profile* profile) {
   return chrome::search::IsInstantExtendedAPIEnabled(profile);
 }
 
+
+bool IsSearchResults(const GURL& url, Profile* profile) {
+  // Profile can be NULL in unit tests.
+  TemplateURLService* template_url_service =
+      TemplateURLServiceFactory::GetForProfile(profile);
+  if (!template_url_service)
+    return false;
+
+  TemplateURL* template_url = template_url_service->GetDefaultSearchProvider();
+  if (!template_url)
+    return false;
+
+  string16 result;
+  return template_url->HasSearchTermsReplacementKey(url) &&
+      template_url->ExtractSearchTermsFromURL(url, &result) && !result.empty();
+}
+
 }  // namespace
 
 namespace chrome {
@@ -37,7 +59,7 @@ namespace search {
 
 SearchTabHelper::SearchTabHelper(content::WebContents* web_contents)
     : WebContentsObserver(web_contents),
-      is_search_enabled_(IsSearchEnabled(web_contents)),
+      is_search_enabled_(IsSearchEnabled(ProfileFromWebContents(web_contents))),
       user_input_in_progress_(false),
       model_(web_contents) {
   if (!is_search_enabled_)
@@ -103,7 +125,7 @@ void SearchTabHelper::UpdateModelBasedOnURL(const GURL& url) {
   if (IsNTP(url)) {
     type = Mode::MODE_NTP;
     origin = Mode::ORIGIN_NTP;
-  } else if (google_util::IsInstantExtendedAPIGoogleSearchUrl(url.spec())) {
+  } else if (IsSearchResults(url, ProfileFromWebContents(web_contents()))) {
     type = Mode::MODE_SEARCH_RESULTS;
     origin = Mode::ORIGIN_SEARCH;
   }