Move Singleton and related structs to namespace base

extensions/browser/api/test/test_api.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_API_TEST_TEST_API_H_
 #define EXTENSIONS_BROWSER_API_TEST_TEST_API_H_
 
 #include "base/values.h"
 #include "extensions/browser/extension_function.h"
 
+namespace base {
+
 template <typename T>
 struct DefaultSingletonTraits;
 
+}  // namespace base
+
 namespace extensions {
 
 // A function that is only available in tests.
 // Prior to running, checks that we are in a testing process.
 class TestExtensionFunction : public SyncExtensionFunction {
  protected:
   ~TestExtensionFunction() override;
 
   // SyncExtensionFunction:
   bool RunSync() override;
@@ skipping 69 matching lines @@
    public:
     static TestConfigState* GetInstance();
 
     void set_config_state(base::DictionaryValue* config_state) {
       config_state_ = config_state;
     }
 
     const base::DictionaryValue* config_state() { return config_state_; }
 
    private:
-    friend struct DefaultSingletonTraits<TestConfigState>;
+    friend struct base::DefaultSingletonTraits<TestConfigState>;
     TestConfigState();
 
     base::DictionaryValue* config_state_;
 
     DISALLOW_COPY_AND_ASSIGN(TestConfigState);
   };
 
   ~TestGetConfigFunction() override;
 
   // TestExtensionFunction:
   bool RunSafe() override;
 };
 
 class TestWaitForRoundTripFunction : public TestExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("test.waitForRoundTrip", UNKNOWN)
 
  protected:
   ~TestWaitForRoundTripFunction() override;
 
   // TestExtensionFunction:
   bool RunSafe() override;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_TEST_TEST_API_H_