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### Preflight Checklist
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* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
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### Issue Details

* **Electron Version:**
  * 8.1.1
* **Operating System:**
  * macOS 10.14.6
* **Last Known Working Electron version:**
  * n/a

### Background
It seems that when resizing a frameless window *with* a BrowserView inside it to a sufficiently narrow width there is an area created at the top of the window that blocks all touches and makes the window draggable (even if the window has movable = false)

### Expected Behavior
- Calling setBounds should allow the window to resize without disrupting the functionality of the BrowserView

### Actual Behavior
Approximately 25% of the window at the top stops accepting input and becomes a drag region

### To Reproduce
**Electron Fiddle:** https://gist.github.com/f80bfd413b7211c31e2feeb0608cafc8

### Screenshots
![ezgif-7-09195467100b](https://user-images.githubusercontent.com/416564/77129173-62157c00-6a29-11ea-9ca4-9bcf79cd3fab.gif)

shell/browser/api/electron_api_browser_window.cc
NativeWindow* native_window) {
  auto* existing = TrackableObject::FromWrappedClass(isolate, native_window);
  if (existing)
    return existing->GetWrapper();
  else
    return v8::Null(isolate);
}
}  
}  
namespace {
using electron::api::BaseWindow;
using electron::api::BrowserWindow;
void Initialize(v8::Local<v8::Object> exports,
                v8::Local<v8::Value> unused,
                v8::Local<v8::Context> context,
                void* priv) {
  v8::Isolate* isolate = context->GetIsolate();
  gin_helper::Dictionary dict(isolate, exports);
  dict.Set("BrowserWindow",
           gin_helper::CreateConstructor<BrowserWindow>(
               isolate, base::BindRepeating(&BrowserWindow::New)));
}
}  
NODE_LINKED_MODULE_CONTEXT_AWARE(electron_browser_window, Initialize)