Fix use of deprecated 'Set' method

R=lazyboy@chromium.org

Bug: v8:7283, v8:8015
Change-Id: I7a311c864bb2c6a5587215fc8e4057247ec15d8a
Reviewed-on: https://chromium-review.googlesource.com/1238454
Commit-Queue: Simon Zünd <szuend@google.com>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595013}

extensions/renderer/dispatcher.cc

@@ -179,7 +179,7 @@ class ChromeNativeHandler : public ObjectBackedNativeHandler {
     v8::Local<v8::Value> chrome(global->Get(chrome_string));
     if (chrome->IsUndefined()) {
       chrome = v8::Object::New(context()->isolate());
-      global->Set(chrome_string, chrome);
+      global->Set(context()->v8_context(), chrome_string, chrome).ToChecked();
     }
     args.GetReturnValue().Set(chrome);
   }

extensions/renderer/js_extension_bindings_system.cc

@@ -36,9 +36,9 @@ namespace {
 // exist.
 v8::Local<v8::Object> GetOrCreateObject(const v8::Local<v8::Object>& object,
                                         const std::string& field,
-                                        v8::Isolate* isolate) {
+                                        ScriptContext* context) {
   v8::Local<v8::String> key =
-      v8::String::NewFromUtf8(isolate, field.c_str(),
+      v8::String::NewFromUtf8(context->isolate(), field.c_str(),
                               v8::NewStringType::kInternalized)
           .ToLocalChecked();
   // If the object has a callback property, it is assumed it is an unavailable
@@ -52,8 +52,8 @@ v8::Local<v8::Object> GetOrCreateObject(const v8::Local<v8::Object>& object,
     return v8::Local<v8::Object>::Cast(value);
   }
 
-  v8::Local<v8::Object> new_object = v8::Object::New(isolate);
-  object->Set(key, new_object);
+  v8::Local<v8::Object> new_object = v8::Object::New(context->isolate());
+  object->Set(context->v8_context(), key, new_object).ToChecked();
   return new_object;
 }
 
@@ -70,7 +70,7 @@ v8::Local<v8::Object> GetOrCreateChrome(ScriptContext* context) {
   v8::Local<v8::Value> chrome(global->Get(chrome_string));
   if (chrome->IsUndefined()) {
     chrome = v8::Object::New(context->isolate());
-    global->Set(chrome_string, chrome);
+    global->Set(context->v8_context(), chrome_string, chrome).ToChecked();
   }
   return chrome->IsObject() ? chrome.As<v8::Object>() : v8::Local<v8::Object>();
 }
@@ -113,7 +113,7 @@ v8::Local<v8::Object> GetOrCreateBindObjectIfAvailable(
       if (bind_object.IsEmpty())
         return v8::Local<v8::Object>();
     }
-    bind_object = GetOrCreateObject(bind_object, split[i], context->isolate());
+    bind_object = GetOrCreateObject(bind_object, split[i], context);
   }
 
   if (only_ancestor_available)