Service CreateNewWindow on the UI thread with a new mojo interface

chrome/browser/android/webapps/single_tab_mode_tab_helper.h

Index: chrome/browser/android/webapps/single_tab_mode_tab_helper.h
diff --git a/chrome/browser/android/webapps/single_tab_mode_tab_helper.h b/chrome/browser/android/webapps/single_tab_mode_tab_helper.h
index 787667b107f1be74a5b4878a25204b56405fc37c..b1db3427309fa622934aaf10682921391c20324e 100644
--- a/chrome/browser/android/webapps/single_tab_mode_tab_helper.h
+++ b/chrome/browser/android/webapps/single_tab_mode_tab_helper.h
@@ -5,44 +5,32 @@
 #ifndef CHROME_BROWSER_ANDROID_WEBAPPS_SINGLE_TAB_MODE_TAB_HELPER_H_
 #define CHROME_BROWSER_ANDROID_WEBAPPS_SINGLE_TAB_MODE_TAB_HELPER_H_
 
-#include <stdint.h>
-
-#include <set>
-
-#include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chrome/browser/ui/blocked_content/blocked_window_params.h"
-#include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
-// Registers and unregisters the IDs of renderers in single tab mode, which
-// are disallowed from opening new windows via
-// ChromeContentBrowserClient::CanCreateWindow().
+namespace content {
+class WebContents;
+}
+
+// Tracks tabs in single tab mode, which are disallowed from opening new windows
+// via ChromeContentBrowserClient::CanCreateWindow().
 class SingleTabModeTabHelper
-    : public content::WebContentsObserver,
-      public content::WebContentsUserData<SingleTabModeTabHelper> {
+    : public content::WebContentsUserData<SingleTabModeTabHelper> {
  public:
-  // Checks if the ID pair is blocked from creating new windows. IO-thread only.
-  static bool IsRegistered(int32_t process_id, int32_t routing_id);
-
   ~SingleTabModeTabHelper() override;
 
-  // Handles opening the given URL through the TabModel.
-  void HandleOpenUrl(const BlockedWindowParams& params);
+  bool block_all_new_windows() const { return block_all_new_windows_; }
 
   // Permanently block this WebContents from creating new windows -- there is no
   // current need to allow toggling this flag on or off.
   void PermanentlyBlockAllNewWindows();
 
-  // content::WebContentsObserver
-  void RenderFrameCreated(content::RenderFrameHost* render_frame_host) override;
-  void RenderFrameDeleted(content::RenderFrameHost* render_frame_host) override;
-
  private:
   explicit SingleTabModeTabHelper(content::WebContents* web_contents);
   friend class content::WebContentsUserData<SingleTabModeTabHelper>;
 
-  bool block_all_new_windows_;
+  bool block_all_new_windows_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(SingleTabModeTabHelper);
 };