Make extensions developer mode adhere to policy

chrome/browser/extensions/extension_service_test_base.h

Index: chrome/browser/extensions/extension_service_test_base.h
diff --git a/chrome/browser/extensions/extension_service_test_base.h b/chrome/browser/extensions/extension_service_test_base.h
index 6a83019ac86ebb8c215a1738e9f13cef752a70f6..9e29615d2b59c533b746711689cc0f792ec608bc 100644
--- a/chrome/browser/extensions/extension_service_test_base.h
+++ b/chrome/browser/extensions/extension_service_test_base.h
@@ -35,6 +35,10 @@ namespace content {
 class BrowserContext;
 }
 
+namespace sync_preferences {
+class TestingPrefServiceSyncable;
+}
+
 namespace extensions {
 
 class ExtensionRegistry;
@@ -54,7 +58,7 @@ class ExtensionServiceTestBase : public testing::Test {
     base::FilePath extensions_install_dir;
     bool autoupdate_enabled;    // defaults to false.
     bool is_first_run;          // defaults to true.
-    bool profile_is_supervised; // defaults to false.
+    bool profile_is_supervised;  // defaults to false.
 
     // Though you could use this constructor, you probably want to use
     // CreateDefaultInitParams(), and then make a change or two.
@@ -118,6 +122,7 @@ class ExtensionServiceTestBase : public testing::Test {
 
   content::BrowserContext* browser_context();
   Profile* profile();
+  sync_preferences::TestingPrefServiceSyncable* testing_pref_service();
   ExtensionService* service() { return service_; }
   ExtensionRegistry* registry() { return registry_; }
   const base::FilePath& extensions_install_dir() const {