Remove the base.gyp dependency from system.gyp

Remove the base.gyp dependency from system.gyp
The dependency is unnecessary and causes build error in the standalone webrtc project due to missing base.gyp when SCTP is enabled (it depends on usrsctp.gyp, which depends on system.gyp). All system.typ needs from base.gyp is the "include_dirs" pointing to ".." relative to "base". So we can remove the dependency on base.gyp and add "include_dirs":["../.."] instead.

BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=243863

[jiayl, 2014-01-08 23:47:27]

PTAL. Thanks!

[Ami GONE FROM CHROMIUM, 2014-01-08 23:53:02]

LGTM

[jiayl, 2014-01-08 23:55:52]

Peter, could you take a look?

[commit-bot: I haz the power, 2014-01-09 00:19:41]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jiayl@chromium.org/128933005/20002

[Peter Lundblad, 2014-01-09 00:25:13]

lgtm

[darin (slow to review), 2014-01-09 08:11:28]

OK, LGTM

[commit-bot: I haz the power, 2014-01-09 12:22:48]

Change committed as 243863