Make order of functions in .cc file matches those in .h file for add_to_homescreen_data_fetcher.*

chrome/browser/android/webapps/add_to_homescreen_data_fetcher.h

Index: chrome/browser/android/webapps/add_to_homescreen_data_fetcher.h
diff --git a/chrome/browser/android/webapps/add_to_homescreen_data_fetcher.h b/chrome/browser/android/webapps/add_to_homescreen_data_fetcher.h
index 12475530fd093eac8d1668e158291cfc2c7ee997..8a9ae31d8f112c63df8952de85c03c1fa42c9108 100644
--- a/chrome/browser/android/webapps/add_to_homescreen_data_fetcher.h
+++ b/chrome/browser/android/webapps/add_to_homescreen_data_fetcher.h
@@ -89,14 +89,17 @@ class AddToHomescreenDataFetcher
   ShortcutInfo& shortcut_info() { return shortcut_info_; }
   const SkBitmap& shortcut_icon() const { return shortcut_icon_; }
 
-  // WebContentsObserver
-  bool OnMessageReceived(const IPC::Message& message) override;
-
  private:
   friend class base::RefCounted<AddToHomescreenDataFetcher>;
 
   ~AddToHomescreenDataFetcher() override;
 
+  // WebContentsObserver
+  bool OnMessageReceived(const IPC::Message& message) override;
+
+  // Called when InstallableManager finishes looking for a manifest and icon.
+  void OnDidPerformInstallableCheck(const InstallableData& data);
+
   // Grabs the favicon for the current URL.
   void FetchFavicon();
   void OnFaviconFetched(
@@ -108,9 +111,6 @@ class AddToHomescreenDataFetcher
   void CreateLauncherIconFromFaviconInBackground(
       const favicon_base::FaviconRawBitmapResult& bitmap_result);
 
-  // Called when InstallableManager finishes looking for a manifest and icon.
-  void OnDidPerformInstallableCheck(const InstallableData& data);
-
   // Creates the launcher icon from the given |icon|.
   void CreateLauncherIconInBackground(const SkBitmap& raw__icon);