Remove WebContents::GetRoutingID().

chrome/browser/ui/webui/print_preview/print_preview_handler.cc

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.cc
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
index 77af2c319ef74b84ccfb2a5ad9962968fff29f58..ac87f3bbfd512a2e870719ca6f121f24326c0cfc 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
@@ -74,6 +74,7 @@
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
+#include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "google_apis/gaia/oauth2_token_service.h"
@@ -921,7 +922,7 @@ void PrintPreviewHandler::HandlePrint(const base::ListValue* args) {
       settings->SetInteger(printing::kPreviewInitiatorHostId,
                            initiator->GetRenderProcessHost()->GetID());
       settings->SetInteger(printing::kPreviewInitiatorRoutingId,
-                           initiator->GetRoutingID());
+                           initiator->GetRenderViewHost()->GetRoutingID());

[Lei Zhang, 2016/11/24 17:18:26]

Uh oh, this is wrong. I have a separate fix:
https://codereview.chromium.org/2527913002/

Hope you don't mind, but I'd like to land that separately and merge to M56.

     }
 
     ClearInitiatorDetails();