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### Issue Details
Electron Version: All Version
Operating System: macOS 10.15.3
Last Known Working Electron version: Never

### Bug
The color picker in devtools does not work.
In devtools if you want to change the colors of the CSS code. When you click on a color a color picker is supposed to appear but it does not appear.

### Screenshots
<img width="1013" alt="Capture d’écran 2020-09-07 à 11 42 44" src="https://user-images.githubusercontent.com/70572698/92374841-988ea280-f100-11ea-96be-afc93f6dd645.png">

shell/browser/ui/inspectable_web_contents.cc
content::WebContents* web_contents,
    PrefService* pref_service,
    bool is_guest)
    : pref_service_(pref_service),
      web_contents_(web_contents),
      is_guest_(is_guest),
      view_(CreateInspectableContentsView(this)) {
  const base::Value* bounds_dict = pref_service_->Get(kDevToolsBoundsPref);
  if (bounds_dict->is_dict()) {
    devtools_bounds_ = DictionaryToRect(bounds_dict);
    
    if (devtools_bounds_.height() < 100 || devtools_bounds_.width() < 100) {
      devtools_bounds_.set_height(600);
      devtools_bounds_.set_width(800);
    }
    if (!IsPointInScreen(devtools_bounds_.origin())) {
      gfx::Rect display;
      if (!is_guest && web_contents->GetNativeView()) {
        display = display::Screen::GetScreen()
                      ->GetDisplayNearestView(web_contents->GetNativeView())
                      .bounds();
      } else {
        display = display::Screen::GetScreen()->GetPrimaryDisplay().bounds();
      }
      devtools_bounds_.set_x(display.x() +
                             (display.width() - devtools_bounds_.width()) / 2);