Add an extension override bubble and warning box for proxy extensions.

chrome/browser/extensions/settings_api_helpers.h

 // Copyright (c) 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_SETTINGS_API_HELPERS_H_
 #define CHROME_BROWSER_EXTENSIONS_SETTINGS_API_HELPERS_H_
 
 #include "chrome/common/extensions/manifest_handlers/settings_overrides_handler.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
 
 struct SettingsOverrides;
 
 // Find which |extension| is overriding a particular |type| of setting. Returns
 // the SettingsOverride object, or NULL if no |extension| is overriding that
 // particular setting.
 const extensions::SettingsOverrides* FindOverridingExtension(
     content::BrowserContext* browser_context,
     SettingsApiOverrideType type,
     const Extension** extension);
 
 // Returns which extension is overriding the homepage in a given
 // |browser_context|. |home_page_url|, if non-NULL, will contain the home_page
 // value the extension has set.
-const Extension* OverridesHomepage(content::BrowserContext* browser_context,
-                                   GURL* home_page_url);
+const Extension* GetExtensionOverridingHomepage(
+    content::BrowserContext* browser_context,
+    GURL* home_page_url);
 
 // Returns which extension is overriding the homepage in a given
 // |browser_context|. |startup_pages|, if non-NULL, will contain the vector of
 // startup page URLs the extension has set.
-const Extension* OverridesStartupPages(content::BrowserContext* browser_context,
-                                       std::vector<GURL>* startup_pages);
+const Extension* GetExtensionOverridingStartupPages(
+    content::BrowserContext* browser_context,
+    std::vector<GURL>* startup_pages);
 
 // Returns which extension is overriding the search engine in a given
 // |browser_context|. |search_provider|, if non-NULL, will contain the search
 // provider the extension has set.
-const Extension* OverridesSearchEngine(
+const Extension* GetExtensionOverridingSearchEngine(
     content::BrowserContext* browser_context,
     api::manifest_types::ChromeSettingsOverrides::Search_provider*
         search_provider);
 
+// Returns which extension is overriding the proxy in a given |browser_context|.

[Devlin, 2014/05/21 17:00:39]

nit: Even though we should probably know it, please add a "or NULL if none
exists" to the comment.

+const Extension* GetExtensionOverridingProxy(
+    content::BrowserContext* browser_context);
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_API_HELPERS_H_