Fix JavaScript alerts from frames with oopif on, after a cross-process click.

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index 2818439ab22a8980e4606b5a33914c7cb16baed1..e87d80e87ab083ed39003f4de2df908227e14f7c 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -735,11 +735,6 @@ IPC_MESSAGE_ROUTED2(ViewMsg_EnumerateDirectoryResponse,
                     int /* request_id */,
                     std::vector<base::FilePath> /* files_in_directory */)
 
-// Tells the renderer to suppress any further modal dialogs until it receives a
-// corresponding ViewMsg_SwapOut message.  This ensures that no
-// PageGroupLoadDeferrer is on the stack for SwapOut.
-IPC_MESSAGE_ROUTED0(ViewMsg_SuppressDialogsUntilSwapOut)
-
 // Instructs the renderer to close the current page, including running the
 // onunload event handler.
 //