Remove tabs from build/all.gyp and replace with spaces

Remove tabs from build/all.gyp and replace with spaces

My previous checking mistakenly used tabs. replacing
them with spaces as required by the style guide.
https://codereview.chromium.org/545103003/

Committed: https://crrev.com/b88bd7efc0f53f21c906cc7fbda8416a4e9f9e84
Cr-Commit-Position: refs/heads/master@{#295122}

[David Abrahams, 2014-09-15 21:59:33]

resetswitch@chromium.org changed reviewers:
+ mikecase@chromium.org, mmoss@chromium.org

[mikecase (-- gone --), 2014-09-15 22:29:13]

mikecase@chromium.org changed reviewers:
+ jbudorick@chromium.org

[mikecase (-- gone --), 2014-09-15 22:29:14]

lgtm

[jbudorick, 2014-09-15 22:29:31]

lgtm

[David Abrahams, 2014-09-16 17:59:03]

The CQ bit was checked by resetswitch@chromium.org

[commit-bot: I haz the power, 2014-09-16 18:00:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/570933004/1

[commit-bot: I haz the power, 2014-09-16 19:19:18]

Committed patchset #1 (id:1) as f435268a854bcb548c2beca2c580ff3b65972fa9

[commit-bot: I haz the power, 2014-09-16 19:20:51]

Patchset 1 (id:??) landed as
https://crrev.com/b88bd7efc0f53f21c906cc7fbda8416a4e9f9e84
Cr-Commit-Position: refs/heads/master@{#295122}