Revert of Establish MojoChildConnection from BrowserChildProcessHostImpl

content/browser/ppapi_plugin_process_host.h

Index: content/browser/ppapi_plugin_process_host.h
diff --git a/content/browser/ppapi_plugin_process_host.h b/content/browser/ppapi_plugin_process_host.h
index 46401e8817fec25f35a2ac2e953dfd79c0b468ce..90c9b09bfd65826e7decea5e97bcc6c1119c2d64 100644
--- a/content/browser/ppapi_plugin_process_host.h
+++ b/content/browser/ppapi_plugin_process_host.h
@@ -177,6 +177,9 @@
 
   const bool is_broker_;
 
+  // A random token used to identify the child process to Mojo.
+  const std::string mojo_child_token_;
+
   std::unique_ptr<BrowserChildProcessHostImpl> process_;
 
   DISALLOW_COPY_AND_ASSIGN(PpapiPluginProcessHost);