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The captioned test was disabled in Linux ASAN because of flakiness. Two
possible causes were identified:

- Possible race between DownloadHighResAvatarTest and
  LoadAvatarFromDiskTest because the path returned by
  GetPathOfHighResAvatarAtIndex is not inside the unique temp directory.

- The directory holding the test icon is not created before running
  base::WriteFile.

This CL fixes the above issues, and changed "const char* bitmap" to
"const char bitmap[]" because of issue 795518.


Bug: 794821, 795518
Change-Id: I0deb2c8acddea86fb94ca27a363afa132f0ac6fc
Reviewed-on: https://chromium-review.googlesource.com/868411Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: WC Leung <lwchkg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531370}