Move/replace/rename URL-based extension getters from ExtensionService to/in ExtensionSet.

chrome/browser/chromeos/offline/offline_load_page.cc

Index: chrome/browser/chromeos/offline/offline_load_page.cc
diff --git a/chrome/browser/chromeos/offline/offline_load_page.cc b/chrome/browser/chromeos/offline/offline_load_page.cc
index 1eae409e87c943d09f9459db0ee9827b761ada42..fe8522fe982eed7dc0610d6373fdf9a86aee5091 100644
--- a/chrome/browser/chromeos/offline/offline_load_page.cc
+++ b/chrome/browser/chromeos/offline/offline_load_page.cc
@@ -91,7 +91,8 @@ std::string OfflineLoadPage::GetHTMLContents() {
   ExtensionService* extensions_service = profile->GetExtensionService();
   // Extension service does not exist in test.
   if (extensions_service)
-    extension = extensions_service->GetExtensionByWebExtent(url());
+    extension = extensions_service->extensions()->GetByWebExtent(
+        ExtensionURLInfo(url()));
 
   if (extension)
     GetAppOfflineStrings(extension, failed_url, &strings);