Fix content script injection when multi-profiles are enabled.

chrome/browser/extensions/user_script_master.cc

Index: chrome/browser/extensions/user_script_master.cc
diff --git a/chrome/browser/extensions/user_script_master.cc b/chrome/browser/extensions/user_script_master.cc
index 78f2335889e64e2e39f9a41df3c140cfc3261826..60f8be0502dba7d036a3f8126950c7640f31b98e 100644
--- a/chrome/browser/extensions/user_script_master.cc
+++ b/chrome/browser/extensions/user_script_master.cc
@@ -362,6 +362,10 @@ void UserScriptMaster::StartLoad() {
 
 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();