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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/api/electron_api_web_contents.cc
.SetMethod("setEmbedder", &WebContents::SetEmbedder)
      .SetMethod("setDevToolsWebContents", &WebContents::SetDevToolsWebContents)
      .SetMethod("getNativeView", &WebContents::GetNativeView)
      .SetMethod("incrementCapturerCount", &WebContents::IncrementCapturerCount)
      .SetMethod("decrementCapturerCount", &WebContents::DecrementCapturerCount)
      .SetMethod("isBeingCaptured", &WebContents::IsBeingCaptured)
      .SetMethod("setWebRTCIPHandlingPolicy",
                 &WebContents::SetWebRTCIPHandlingPolicy)
      .SetMethod("getWebRTCIPHandlingPolicy",
                 &WebContents::GetWebRTCIPHandlingPolicy)
      .SetMethod("_grantOriginAccess", &WebContents::GrantOriginAccess)
      .SetMethod("takeHeapSnapshot", &WebContents::TakeHeapSnapshot)
      .SetMethod("setImageAnimationPolicy",
                 &WebContents::SetImageAnimationPolicy)
      .SetProperty("id", &WebContents::ID)
      .SetProperty("session", &WebContents::Session)
      .SetProperty("hostWebContents", &WebContents::HostWebContents)
      .SetProperty("devToolsWebContents", &WebContents::DevToolsWebContents)
      .SetProperty("debugger", &WebContents::Debugger)
      .SetProperty("mainFrame", &WebContents::MainFrame)
      .Build();
}
const char* WebContents::GetTypeName() {
  return "WebContents";
}
ElectronBrowserContext* WebContents::GetBrowserContext() const {
  return static_cast<ElectronBrowserContext*>(
      ontents()->GetBrowserContext());
}
 static