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

extensions/renderer/script_context.cc

Index: extensions/renderer/script_context.cc
diff --git a/extensions/renderer/script_context.cc b/extensions/renderer/script_context.cc
index f384f0cb6dc7d0a89891734accef04fafef3035f..ac87f7098f8fb3f03c2f59e845877f895e74246e 100644
--- a/extensions/renderer/script_context.cc
+++ b/extensions/renderer/script_context.cc
@@ -176,7 +176,7 @@ content::RenderFrame* ScriptContext::GetRenderFrame() const {
 }
 
 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());
@@ -196,6 +196,11 @@ v8::Local<v8::Value> ScriptContext::CallFunction(
           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