Replace tabs with spaces in gyp file.

Replace tabs with spaces in gyp file.

Part of components/sessions.gypi has ended up indented with tabs;
replace with spaces before refactoring.

BUG=
NOTRY=true

Committed: https://crrev.com/4ff34e7f21c7002a2b1461c3182419a76ca9c631
Cr-Commit-Position: refs/heads/master@{#322554}

[Torne, 2015-03-26 18:26:32]

torne@chromium.org changed reviewers:
+ sky@chromium.org

[Torne, 2015-03-26 18:26:33]

Do you object to me fixing the whitespace here? Noticed the inconsistency when
trying to remove android_webview_build.

[sky, 2015-03-26 19:40:47]

One question, does gn format replace the tabs with spaces?

[sky, 2015-03-26 19:45:28]

LGTM - my question about gn format is more that we should make gn format do
this. But that's separate from whether you can land this.

[Torne, 2015-03-27 11:35:53]

The CQ bit was checked by torne@chromium.org

[commit-bot: I haz the power, 2015-03-27 11:36:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1038013002/1

[commit-bot: I haz the power, 2015-03-27 11:36:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-27 11:37:36]

Patchset 1 (id:??) landed as
https://crrev.com/4ff34e7f21c7002a2b1461c3182419a76ca9c631
Cr-Commit-Position: refs/heads/master@{#322554}

[Torne, 2015-03-27 11:37:59]

On 2015/03/26 19:40:47, sky wrote:
> One question, does gn format replace the tabs with spaces?

gn's parser just rejects tabs in the first place and refuses to touch the file
at all. gn format does the same it seems. So, it should not be possible for gn
files to end up containing tabs :)