Make some updates to extension iconography.

chrome/browser/extensions/api/omnibox/omnibox_api.h

Index: chrome/browser/extensions/api/omnibox/omnibox_api.h
diff --git a/chrome/browser/extensions/api/omnibox/omnibox_api.h b/chrome/browser/extensions/api/omnibox/omnibox_api.h
index 9d88a1a9e6a742d878e3846904e8ffa3204bfb99..5fbec3e645d9206f228c3ae25890f6bcf93309c5 100644
--- a/chrome/browser/extensions/api/omnibox/omnibox_api.h
+++ b/chrome/browser/extensions/api/omnibox/omnibox_api.h
@@ -95,13 +95,10 @@ class OmniboxAPI : public BrowserContextKeyedAPI,
   // KeyedService implementation.
   void Shutdown() override;
 
-  // Returns the icon to display in the omnibox for the given extension.
+  // Returns the icon to display in the location bar or omnibox popup for the
+  // given extension.
   gfx::Image GetOmniboxIcon(const std::string& extension_id);
 
-  // Returns the icon to display in the omnibox popup window for the given
-  // extension.
-  gfx::Image GetOmniboxPopupIcon(const std::string& extension_id);
-
  private:
   friend class BrowserContextKeyedAPIFactory<OmniboxAPI>;
 
@@ -136,7 +133,6 @@ class OmniboxAPI : public BrowserContextKeyedAPI,
 
   // Keeps track of favicon-sized omnibox icons for extensions.
   ExtensionIconManager omnibox_icon_manager_;
-  ExtensionIconManager omnibox_popup_icon_manager_;
 
   std::unique_ptr<TemplateURLService::Subscription> template_url_sub_;