Fix a typo

BUG=None
R=dpranke

Change-Id: Ia16a3a30bc8339d81847725ed9a23b2694e4169e
Reviewed-on: https://chromium-review.googlesource.com/c/1464772
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>

win_toolchain/get_toolchain_if_necessary.py

@@ -408,7 +408,7 @@ def RemoveUnusedToolchains(root):
   for toolchain in valid_toolchains:
     toolchain_age_in_sec = time.time() - toolchain[0]
     if toolchain_age_in_sec > toolchain_expiration_time:
-      print ('Removing version %s of the Win toolchain has it hasn\'t been used'
+      print ('Removing version %s of the Win toolchain as it hasn\'t been used'
              ' in the past %d days.' % (toolchain[1],
                                         toolchain_age_in_sec / 60 / 60 / 24))
       RemoveToolchain(root, toolchain[1], True)