URL Completion Breaks Additional Input

[jonathansampson]

• Did you search for similar issues before submitting this one?
  Yes

• Describe the issue you encountered:
  When attempting to build off of an auto-completed URL, much of the URL may be lost.

• Platform (Win7, 8, 10? macOS? Linux distro?):
  Desktop

• Brave Version (revision SHA):
  04ceba3

• Steps to reproduce:

  1. Open a new tab, type "face"
  2. When "book.com" is added to the end, press the right arrow key
  3. Type "/bravesoftware"

• Actual result:
  book.com is removed from the URL, leaving only "face/bravesoftware".

• Expected result:
  "/bravesoftware" will be added to the URL, rather than replacing a portion of it.

• Will the steps above reproduce in a fresh profile? If not what other info can be added?
  Yes

• Is this an issue in the currently released version?
  No

• Can this issue be consistently reproduced?
  Yes

• Screenshot if needed: