URL bar selects autocomplete result on keypress

[bsclifton]

Test plan

#8824 (comment)

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Did you search for similar issues before submitting this one?
I only did a quick search, there may already be an issue (help appreciated finding)

Describe the issue you encountered:
Auto-complete results are being chosen when I'm doing a very specific set of key presses when focus is in the URL bar (see steps to repro).

I found this when trying my default logic for copy/paste, which is stupid now that I'm typing it out... but it did uncover this. If you instead use cmd + A to select the contents of the URL bar (instead of what is outlined in step 3), it does work and you can cmd + C it just fine (which is more efficient anyways)

Expected behavior:
Auto-complete result should not be picked unless I use up/down arrow

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

• Brave Version:
  0.12.10

• Steps to reproduce:

  1. Visit https://www.oediscountparts.com/partlocator/index.cfm?siteid=215242
  2. Click inside the URL bar to give it focus and delete the path portion of the URL
     - Hit end (windows) or cmd + right arrow (mac) to move cursor to end
     - hold shift and the modifier key (either ctrl on windows or option on mac) and press left arrow key repeatedly, until you've selected /partlocator/index.cfm?siteid=215242
     - Press delete or backspace to remove that part
  3. Try to select the rest of whats left
     - hold shift + modifier key (cmd / ctrl) and then press left arrow key
     - notice that the first result is auto-selected (which then overrides the URL you had in the box)

• Screenshot if needed:

• Any related issues: