Add a URL param to indicate group selection in Instant field trial.

chrome/browser/search_engines/template_url_service_unittest.cc

Index: chrome/browser/search_engines/template_url_service_unittest.cc
diff --git a/chrome/browser/search_engines/template_url_service_unittest.cc b/chrome/browser/search_engines/template_url_service_unittest.cc
index 7661ec1a3f8648997df41c818d6741328c355852..e048c21486ce61a472850e3d66ee87a12db2c7ef 100644
--- a/chrome/browser/search_engines/template_url_service_unittest.cc
+++ b/chrome/browser/search_engines/template_url_service_unittest.cc
@@ -891,8 +891,9 @@ TEST_F(TemplateURLServiceTest, ChangeGoogleBaseValue) {
   EXPECT_TRUE(model()->GetTemplateURLForHost("google.com") == NULL);
   EXPECT_EQ("foo.com", t_url->url()->GetHost());
   EXPECT_EQ(ASCIIToUTF16("foo.com"), t_url->keyword());
-  EXPECT_EQ("http://foo.com/?q=x", t_url->url()->ReplaceSearchTerms(*t_url,
-      ASCIIToUTF16("x"), TemplateURLRef::NO_SUGGESTIONS_AVAILABLE, string16()));
+  EXPECT_EQ("http://foo.com/?q=x", t_url->url()->ReplaceSearchTerms(NULL,
+      *t_url, ASCIIToUTF16("x"), TemplateURLRef::NO_SUGGESTIONS_AVAILABLE,
+      string16()));
 }
 
 struct QueryHistoryCallbackImpl {
@@ -929,8 +930,8 @@ TEST_F(TemplateURLServiceTest, GenerateVisitOnKeyword) {
   HistoryService* history =
       profile()->GetHistoryService(Profile::EXPLICIT_ACCESS);
   history->AddPage(
-      GURL(t_url->url()->ReplaceSearchTerms(*t_url, ASCIIToUTF16("blah"), 0,
-                                            string16())),
+      GURL(t_url->url()->ReplaceSearchTerms(NULL, *t_url, ASCIIToUTF16("blah"),
+                                            0, string16())),
       NULL, 0, GURL(), PageTransition::KEYWORD, history::RedirectList(),
       history::SOURCE_BROWSED, false);