Fix content script injection when multi-profiles are enabled.

chrome/browser/extensions/user_script_master.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/user_script_master.h"
 
 #include <string>
 #include <vector>
 
 #include "base/file_path.h"
@@ skipping 344 matching lines @@
 
 void UserScriptMaster::StartLoad() {
   if (!script_reloader_)
     script_reloader_ = new ScriptReloader(this);
 
   script_reloader_->StartLoad(user_scripts_);
 }
 
 void UserScriptMaster::SendUpdate(RenderProcessHost* process,
                                   base::SharedMemory* shared_memory) {
+  // Make sure we only send user scripts to processes in our profile.
+  if (!profile_->IsSameProfile(process->profile()))
+    return;
+
   // If the process is being started asynchronously, early return.  We'll end up
   // calling InitUserScripts when it's created which will call this again.
   base::ProcessHandle handle = process->GetHandle();
   if (!handle)
     return;
 
   base::SharedMemoryHandle handle_for_process;
   if (!shared_memory->ShareToProcess(handle, &handle_for_process))
     return;  // This can legitimately fail if the renderer asserts at startup.
 
   if (base::SharedMemory::IsHandleValid(handle_for_process))
     process->Send(new ExtensionMsg_UpdateUserScripts(handle_for_process));
 }