Revert of Stop passing raw pointers to base::Value API in c/b/chromeos and c/b/extensions

chrome/browser/extensions/api/proxy/proxy_api.h

 // Copyright (c) 2012 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.
 
 // Defines the Chrome Extensions Proxy Settings API relevant classes to realize
 // the API as specified in the extension API JSON.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_PROXY_PROXY_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_PROXY_PROXY_API_H_
 
@@ skipping 14 matching lines @@
 
 // Class to convert between the representation of proxy settings used
 // in the Proxy Settings API and the representation used in the PrefStores.
 // This plugs into the ExtensionPreferenceAPI to get and set proxy settings.
 class ProxyPrefTransformer : public PrefTransformerInterface {
  public:
   ProxyPrefTransformer();
   ~ProxyPrefTransformer() override;
 
   // Implementation of PrefTransformerInterface.
-  std::unique_ptr<base::Value> ExtensionToBrowserPref(
-      const base::Value* extension_pref,
-      std::string* error,
-      bool* bad_message) override;
-  std::unique_ptr<base::Value> BrowserToExtensionPref(
-      const base::Value* browser_pref) override;
+  base::Value* ExtensionToBrowserPref(const base::Value* extension_pref,
+                                      std::string* error,
+                                      bool* bad_message) override;
+  base::Value* BrowserToExtensionPref(const base::Value* browser_pref) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ProxyPrefTransformer);
 };
 
 // This class observes proxy error events and routes them to the appropriate
 // extensions listening to those events. All methods must be called on the IO
 // thread unless otherwise specified.
 class ProxyEventRouter {
  public:
@@ skipping 13 matching lines @@
 
   ProxyEventRouter();
   ~ProxyEventRouter();
 
   DISALLOW_COPY_AND_ASSIGN(ProxyEventRouter);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_PROXY_PROXY_API_H_