Performing Ctrl+A while a tab is focused runs Chrome's select-all

[winstliu]

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: http://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: http://flight-manual.atom.io/hacking-atom/sections/debugging/
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Description

When a tab is focused and Ctrl+A is pressed, Chrome intercepts the keybinding and performs its own select-all.

This seems related to #440 - ideally the tab shouldn't be focusable at all and immediately transfer focus to the file.

Steps to Reproduce

1. Focus tab
2. Ctrl+A/cmd-a

Expected behavior: File's contents to be selected

Actual behavior: See picture above

Reproduces how often: 100%

Versions

Atom    : 1.23.0-dev-cfbee0a9e
Electron: 1.6.15
Chrome  : 56.0.2924.87
Node    : 7.4.0

[winstliu]

This has been improved slightly such that the contents of the file are no longer selected, but it still occurs for things like the Keybinding Resolver.