Remove the deprecated function ExtensionService::extensions().

chrome/browser/extensions/extension_browsertest.h

Index: chrome/browser/extensions/extension_browsertest.h
diff --git a/chrome/browser/extensions/extension_browsertest.h b/chrome/browser/extensions/extension_browsertest.h
index 7f41236d3b13a5ca1ab469a6c7ffe1731f709cf4..254aa1ee3c2ad37b6bfe09d23948c76c3ad132b7 100644
--- a/chrome/browser/extensions/extension_browsertest.h
+++ b/chrome/browser/extensions/extension_browsertest.h
@@ -72,7 +72,8 @@ class ExtensionBrowserTest : virtual public InProcessBrowserTest {
   virtual Profile* profile();
 
   static const extensions::Extension* GetExtensionByPath(
-      const extensions::ExtensionSet* extensions, const base::FilePath& path);
+      const extensions::ExtensionSet& extensions,
+      const base::FilePath& path);
 
   // InProcessBrowserTest
   void SetUp() override;