Fix TestFileToURLConversion on Linux non-X11 builds

Fix TestFileToURLConversion on Linux non-X11 builds

Similar to ChromeOS, non-X11 Linux builds (such as Ozone) do not provide the
filename to URL conversion.

BUG=none

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=283468

[dnicoara, 2014-07-15 22:18:35]

PTAL

This should fix running the unittest on Ozone.

[sky, 2014-07-15 23:44:34]

LGTM

[dnicoara, 2014-07-16 00:03:10]

The CQ bit was checked by dnicoara@chromium.org

[commit-bot: I haz the power, 2014-07-16 00:06:52]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dnicoara@chromium.org/394983002/1

[commit-bot: I haz the power, 2014-07-16 05:32:45]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  mac_chromium_compile_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/mac_chromium_compile_...)
  mac_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/mac_chromium_rel/buil...)
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)
  win_chromium_x64_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_x64_rel/...)

[commit-bot: I haz the power, 2014-07-16 19:15:54]

Change committed as 283468