Rework ExtensionApiUnittest to run in extensions_unittests, removing its Chrome dependencies.

chrome/browser/extensions/extension_api_unittest.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_API_UNITTEST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_API_UNITTEST_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 17 matching lines @@
 // Use this class to enable calling API functions in a unittest.
 // By default, this class will create and load an empty unpacked |extension_|,
 // which will be used in all API function calls. This extension can be
 // overridden using set_extension().
 // By default, this class does not create a WebContents for the API functions.
 // If a WebContents is needed, calling CreateBackgroundPage() will create a
 // background page for the extension and use it in API function calls. (If
 // needed, this could be expanded to allow for alternate WebContents).
 // When calling RunFunction[AndReturn*], |args| should be in JSON format,
 // wrapped in a list. See also RunFunction* in extension_function_test_utils.h.
+// TODO(yoz): Move users of this base class to use the equivalent base class
+// in extensions/browser/api_unittest.h.
 class ExtensionApiUnittest : public BrowserWithTestWindowTest {
  public:
   ExtensionApiUnittest();
   virtual ~ExtensionApiUnittest();
 
   content::WebContents* contents() { return contents_; }
 
   const Extension* extension() const { return extension_.get(); }
   scoped_refptr<Extension> extension_ref() { return extension_; }
   void set_extension(scoped_refptr<Extension> extension) {
@@ skipping 41 matching lines @@
   // or NULL.
   content::WebContents* contents_;
 
   // The Extension used when running API function calls.
   scoped_refptr<Extension> extension_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_API_UNITTEST_H_