[cleanup][v8] Replace uses of deprecated API

R=raymes@chromium.org

Bug: v8:7295 v8:8015
Change-Id: Id9a5334b9e85e6f37200d4a89eb7b80eec444958
Reviewed-on: https://chromium-review.googlesource.com/1238156Reviewed-by: Raymes Khoury <raymes@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593496}

content/renderer/pepper/message_channel.cc

@@ -211,13 +211,17 @@ v8::Local<v8::Value> MessageChannel::GetNamedProperty(
 
   PepperTryCatchV8 try_catch(instance_, &var_converter_, isolate);
   if (identifier == kPostMessage) {
+    v8::Local<v8::Context> context = isolate->GetCurrentContext();
     return GetFunctionTemplate(isolate, identifier,
                                &MessageChannel::PostMessageToNative)
-        ->GetFunction();
+        ->GetFunction(context)
+        .ToLocalChecked();
   } else if (identifier == kPostMessageAndAwaitResponse) {
+    v8::Local<v8::Context> context = isolate->GetCurrentContext();
     return GetFunctionTemplate(isolate, identifier,
                                &MessageChannel::PostBlockingMessageToNative)
-        ->GetFunction();
+        ->GetFunction(context)
+        .ToLocalChecked();
   }
 
   std::map<std::string, ScopedPPVar>::const_iterator it =

content/renderer/pepper/plugin_object.cc

@@ -239,9 +239,12 @@ v8::Local<v8::Value> PluginObject::GetPropertyOrMethod(v8::Isolate* isolate,
     return v8::Local<v8::Value>();
 
   if (has_method) {
+    v8::Local<v8::Context> context = isolate->GetCurrentContext();
     const std::string& identifier =
         StringVar::FromPPVar(identifier_var)->value();
-    return GetFunctionTemplate(isolate, identifier)->GetFunction();
+    return GetFunctionTemplate(isolate, identifier)
+        ->GetFunction(context)
+        .ToLocalChecked();
   }
 
   return v8::Local<v8::Value>();