Persistent command window shown when launching from console

Description

Persistent command window shown when launching from console

Steps to Reproduce

1. Build from master and launch by running npm run start Release in a git bash window
2. Empty command prompt window pops up which is persistent
3. Close the command prompt, opens another one
4. Sometimes closing the command prompt causes a tab to have webview crash

Actual result:

Expected result:

Should not retain the command prompt. after browser is launched

Reproduces how often:

100% on Windows

Brave version (about:brave info)

master

Reproducible on current release:

N/A

Website problems only:

• Does the issue resolve itself when disabling Brave Shields?
• Is the issue reproducible on the latest version of Chrome?

Additional Information

cc: @emerick @bbondy

[darkdh]

https://github.com/brave/brave-core/pull/531#issuecomment-425981021

[btlechowski]

Verification passed on

Brave	0.59.14 Chromium: 72.0.3626.28 (Official Build) beta(64-bit)
Revision	997b1040b63bac324e815797ba52be0cd8f616ed-refs/branch-heads/3626@{#461}
OS	Windows 7

Used Test Plan from https://github.com/brave/brave-core/pull/945

Utility: Audio Service was not found in Task Manager