Settings Rewrite: Fork SyncSetupHandler for MD-Settings

content/public/browser/web_ui_message_handler.h

Index: content/public/browser/web_ui_message_handler.h
diff --git a/content/public/browser/web_ui_message_handler.h b/content/public/browser/web_ui_message_handler.h
index b6908769a00b28a824e51271db0a724a03e39c08..107ca51ff41197143fd7274f34aa1a2b29264f09 100644
--- a/content/public/browser/web_ui_message_handler.h
+++ b/content/public/browser/web_ui_message_handler.h
@@ -28,7 +28,12 @@ class WebUIImpl;
 // host is destroyed.
 class CONTENT_EXPORT WebUIMessageHandler {
  public:
+  explicit WebUIMessageHandler(WebUI* web_ui) : web_ui_(web_ui) {}
+
+  // DEPRECATED. Use WebUIMessageHandler(WebUI*) constructor instead.
+  // TODO(tommycli): Remove once legacy callers gone.
   WebUIMessageHandler() : web_ui_(nullptr) {}
+
   virtual ~WebUIMessageHandler() {}
 
  protected:
@@ -56,6 +61,8 @@ class CONTENT_EXPORT WebUIMessageHandler {
   // Returns the attached WebUI for this handler.
   WebUI* web_ui() const { return web_ui_; }
 
+  // DEPRECATED. Attach during construction instead. May be kept for testing.
+  // TODO(tommycli): Remove once callers gone - or rename to SetWebUIForTesting.
   // Sets the attached WebUI - exposed to subclasses for testing purposes.
   void set_web_ui(WebUI* web_ui) { web_ui_ = web_ui; }