Move Sync-specific tests from ExtensionServiceTest into new file

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 85b4d3c413b62801c1090b799500491014b97de3..78a0dd2893955c0469457fa7e047a8dcbf4e2dab 100644
--- a/chrome/browser/extensions/extension_service_test_base.h
+++ b/chrome/browser/extensions/extension_service_test_base.h
@@ -5,6 +5,8 @@
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_TEST_BASE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_TEST_BASE_H_
 
+#include <string>
+
 #include "base/at_exit.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
@@ -89,6 +91,20 @@ class ExtensionServiceTestBase : public testing::Test {
   // Resets the browser thread bundle to one with |options|.
   void ResetThreadBundle(int options);
 
+  // Helpers to check the existence and values of extension prefs.
+  size_t GetPrefKeyCount();
+  void ValidatePrefKeyCount(size_t count);
+  testing::AssertionResult ValidateBooleanPref(
+      const std::string& extension_id,
+      const std::string& pref_path,
+      bool expected_val);
+  void ValidateIntegerPref(const std::string& extension_id,
+                           const std::string& pref_path,
+                           int expected_val);
+  void ValidateStringPref(const std::string& extension_id,
+                          const std::string& pref_path,
+                          const std::string& expected_val);
+
   // TODO(rdevlin.cronin): Pull out more methods from ExtensionServiceTest that
   // are commonly used and/or reimplemented. For instance, methods to install
   // extensions from various locations, etc.