Remove Windows ifdefs in AshNativeCursorManagerTest

Now that we don't support Ash on Windows we don't need all the conditional
code in this test.

The reason I'm cleaning up this one first is because it contains the string
"ash_unittests.exe" and I'm eliminating all references to Windows-specific
binaries.

BUG=670351
TEST=ash_unittests

Review-Url: https://codereview.chromium.org/2529293014
Cr-Commit-Position: refs/heads/master@{#436088}
1 file changed