Replace Handle<> with Local in remaining gin/*

gin/wrappable.cc

Index: gin/wrappable.cc
diff --git a/gin/wrappable.cc b/gin/wrappable.cc
index 4137609cf917566534cdbe9164e8889b5f59bf55..09c17a3c85dfa8fbadccef236b8be988e7f2e0f5 100644
--- a/gin/wrappable.cc
+++ b/gin/wrappable.cc
@@ -35,7 +35,7 @@ void WrappableBase::SecondWeakCallback(
   delete wrappable;
 }
 
-v8::Handle<v8::Object> WrappableBase::GetWrapperImpl(v8::Isolate* isolate,
+v8::Local<v8::Object> WrappableBase::GetWrapperImpl(v8::Isolate* isolate,
                                                      WrapperInfo* info) {
   if (!wrapper_.IsEmpty()) {
     return v8::Local<v8::Object>::New(isolate, wrapper_);
@@ -49,7 +49,7 @@ v8::Handle<v8::Object> WrappableBase::GetWrapperImpl(v8::Isolate* isolate,
     data->SetObjectTemplate(info, templ);
   }
   CHECK_EQ(kNumberOfInternalFields, templ->InternalFieldCount());
-  v8::Handle<v8::Object> wrapper = templ->NewInstance();
+  v8::Local<v8::Object> wrapper = templ->NewInstance();
   // |wrapper| may be empty in some extreme cases, e.g., when
   // Object.prototype.constructor is overwritten.
   if (wrapper.IsEmpty()) {
@@ -67,11 +67,11 @@ v8::Handle<v8::Object> WrappableBase::GetWrapperImpl(v8::Isolate* isolate,
 
 namespace internal {
 
-void* FromV8Impl(v8::Isolate* isolate, v8::Handle<v8::Value> val,
+void* FromV8Impl(v8::Isolate* isolate, v8::Local<v8::Value> val,
                  WrapperInfo* wrapper_info) {
   if (!val->IsObject())
     return NULL;
-  v8::Handle<v8::Object> obj = v8::Handle<v8::Object>::Cast(val);
+  v8::Local<v8::Object> obj = v8::Local<v8::Object>::Cast(val);
   WrapperInfo* info = WrapperInfo::From(obj);
 
   // If this fails, the object is not managed by Gin. It is either a normal JS