Implement important sites dialog for desktop.

chrome/browser/flag_descriptions.h

Index: chrome/browser/flag_descriptions.h
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 3184daab40c4b1f50ee7fdf6fd097419e0d5c7ce..11b58565ab56f15a2d3bc323ed2eabb6a268fcf0 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -395,6 +395,9 @@ extern const char kIconNtpDescription[];
 extern const char kIgnoreGpuBlacklistName[];
 extern const char kIgnoreGpuBlacklistDescription[];
 
+extern const char kImportantSitesInCbdName[];
+extern const char kImportantSitesInCbdDescription[];
+
 extern const char kInertVisualViewportName[];
 extern const char kInertVisualViewportDescription[];
 
@@ -946,9 +949,6 @@ extern const char kHerbPrototypeChoicesName[];
 extern const char kHerbPrototypeChoicesDescription[];
 extern const char kHerbPrototypeFlavorElderberry[];
 
-extern const char kImportantSitesInCbdName[];
-extern const char kImportantSitesInCbdDescription[];
-
 extern const char kLsdPermissionPromptName[];
 extern const char kLsdPermissionPromptDescription[];