Add fallback mechanism to release Extension ports if the JS context has been destroyed.

extensions/renderer/script_context.cc

 // Copyright 2014 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 "extensions/renderer/script_context.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
@@ skipping 158 matching lines @@
   return NULL;
 }
 
 content::RenderFrame* ScriptContext::GetRenderFrame() const {
   if (web_frame_)
     return content::RenderFrame::FromWebFrame(web_frame_);
   return NULL;
 }
 
 v8::Local<v8::Value> ScriptContext::CallFunction(
-    v8::Local<v8::Function> function,
+    const v8::Local<v8::Function>& function,
     int argc,
     v8::Local<v8::Value> argv[]) const {
   v8::EscapableHandleScope handle_scope(isolate());
   v8::Context::Scope scope(v8_context());
 
   blink::WebScopedMicrotaskSuppression suppression;
   if (!is_valid_) {
     return handle_scope.Escape(
         v8::Local<v8::Primitive>(v8::Undefined(isolate())));
   }
 
   v8::Local<v8::Object> global = v8_context()->Global();
   if (!web_frame_)
     return handle_scope.Escape(function->Call(global, argc, argv));
   return handle_scope.Escape(
       v8::Local<v8::Value>(web_frame_->callFunctionEvenIfScriptDisabled(
           function, global, argc, argv)));
 }
 
+v8::Local<v8::Value> ScriptContext::CallFunction(
+    const v8::Local<v8::Function>& function) const {
+  return CallFunction(function, 0, nullptr);
+}
+
 Feature::Availability ScriptContext::GetAvailability(
     const std::string& api_name) {
   // Hack: Hosted apps should have the availability of messaging APIs based on
   // the URL of the page (which might have access depending on some extension
   // with externally_connectable), not whether the app has access to messaging
   // (which it won't).
   const Extension* extension = extension_.get();
   if (extension && extension->is_hosted_app() &&
       (api_name == "runtime.connect" || api_name == "runtime.sendMessage")) {
     extension = NULL;
@@ skipping 174 matching lines @@
     v8::Local<v8::Value> argv[]) {
   return context_->CallFunction(function, argc, argv);
 }
 
 gin::ContextHolder* ScriptContext::Runner::GetContextHolder() {
   v8::HandleScope handle_scope(context_->isolate());
   return gin::PerContextData::From(context_->v8_context())->context_holder();
 }
 
 }  // namespace extensions