Update refernces to Blink's Platform API (cc)

Update refernces to Blink's Platform API (cc)

These headers have moved from Source/Platform/chromium/public to
public/platform. This CL updates CC's references to the old location to point
to the new location. After this CL lands, I'll remove the forwarding headers
that are letting these references still work.

TBR=jamesr@chromium.org
BUG=239545
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=202990

[abarth-chromium, 2013-05-29 19:33:15]

jamesr gave an LGTM in https://codereview.chromium.org/15462003/

[commit-bot: I haz the power, 2013-05-29 19:33:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/abarth@chromium.org/16085003/1

[jamesr, 2013-05-29 19:35:45]

lgtm

[commit-bot: I haz the power, 2013-05-29 22:05:28]

Change committed as 202990