Redo node 7.4 error handling patch

[kevinsawicki]

This pull request redoes the patch we apply to node to configure error handling for things like uncaughtException events.

When I upgraded to Node 7.4.0 in #8406 the patch was ported forward but the diff lines were moved to a new function that isn't called by either LoadEnvironment or CreateEnvironment so they weren't getting properly set.

Node 6.5.0 patch: electron/node@f098774

Original Node 7.4.0 patch: electron/node@f1e3c10

New Node 7.4.0 patch: electron/node@8416f53

The diff of the old patch vs the new patch is:

diff --git a/src/node.cc b/src/node.cc
index f80157e..66233d4 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -3415,6 +3415,13 @@ static void RawDebug(const FunctionCallbackInfo<Value>& args) {
 
 
 void LoadEnvironment(Environment* env) {
+  if (g_standalone_mode) {
+    env->isolate()->AddMessageListener(OnMessage);
+  }
+  if (g_upstream_node_mode) {
+    env->isolate()->SetFatalErrorHandler(OnFatalError);
+  }
+
   HandleScope handle_scope(env->isolate());
 
   TryCatch try_catch(env->isolate());
@@ -4500,14 +4507,10 @@ inline int Start(uv_loop_t* event_loop,
   if (isolate == nullptr)
     return 12;  // Signal internal error.
 
-  if (g_standalone_mode) {  // No indent to minimize diff.
   isolate->AddMessageListener(OnMessage);
-  } // g_standalone_mode
   isolate->SetAbortOnUncaughtExceptionCallback(ShouldAbortOnUncaughtException);
   isolate->SetAutorunMicrotasks(false);
-  if (g_upstream_node_mode) {  // No indent to minimize diff.
   isolate->SetFatalErrorHandler(OnFatalError);
-  } // g_upstream_node_mode
 
   if (track_heap_objects) {
     isolate->GetHeapProfiler()->StartTrackingHeapObjects(true);

Closes #8499