Remove "Skipping X download..." messages from gclient hooks

Now that gclient is much quieter about its output (see crbug.com/772741),
these always-emitted messages make it louder than necessary.

Change-Id: I864676c4ca57d4c060f7f58bc770d8d670695639
Reviewed-on: https://chromium-review.googlesource.com/731118Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48808}

tools/gcmole/download_gcmole_tools.py

@@ -18,5 +18,3 @@ if re.search(r'\bgcmole=1', os.environ.get('GYP_DEFINES', '')):
     '-s', SHA1_PATH,
     '--platform=linux*'
   ])
-else:
-  print 'Skipping gcmole download as gcmole is not set in gyp flags.'

tools/jsfunfuzz/download_jsfunfuzz.py

@@ -18,5 +18,3 @@ if re.search(r'\bjsfunfuzz=1', os.environ.get('GYP_DEFINES', '')):
     '-s', SHA1_PATH,
     '--platform=linux*'
   ])
-else:
-  print 'Skipping jsfunfuzz download as jsfunfuzz is not set in gyp flags.'