Introduce InfoBarTabService API.

chrome/browser/geolocation/geolocation_browsertest.cc

Index: chrome/browser/geolocation/geolocation_browsertest.cc
diff --git a/chrome/browser/geolocation/geolocation_browsertest.cc b/chrome/browser/geolocation/geolocation_browsertest.cc
index 7edf81256adf5c00f6d665c1b02c79a053ca37e9..8022e646e82a80a52f18dce1ce76045d146fe14a 100644
--- a/chrome/browser/geolocation/geolocation_browsertest.cc
+++ b/chrome/browser/geolocation/geolocation_browsertest.cc
@@ -568,10 +568,10 @@ IN_PROC_BROWSER_TEST_F(GeolocationBrowserTest,
 
   InfoBarTabHelper* infobar_helper =
       chrome::GetActiveTabContents(current_browser_)->infobar_tab_helper();
-  size_t num_infobars_before_cancel = infobar_helper->infobar_count();
+  size_t num_infobars_before_cancel = infobar_helper->GetInfoBarCount();
   // Change the iframe, and ensure the infobar is gone.
   IFrameLoader change_iframe_1(current_browser_, 1, current_url_);
-  size_t num_infobars_after_cancel = infobar_helper->infobar_count();
+  size_t num_infobars_after_cancel = infobar_helper->GetInfoBarCount();
   EXPECT_EQ(num_infobars_before_cancel, num_infobars_after_cancel + 1);
 }