Cleanup namespace usage in Source/core/platform/[A-Z]*.h

Cleanup namespace usage in Source/core/platform/[A-Z]*.h

Cleanup namespace usage in Source/core/platform/[A-Z]*.h

- Merge multiple |namespace blink {}| block
- Remove unnecessary blink:: prefixes
- Make blank lines consistent

BUG=None

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180218

[Sunil Ratnu, 2014-08-13 12:15:12]

Please review this. Thanks!

[abarth-chromium, 2014-08-13 16:29:34]

The CQ bit was checked by abarth@chromium.org

[abarth-chromium, 2014-08-13 16:29:35]

lgtm

[commit-bot: I haz the power, 2014-08-13 16:30:01]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/sunil.ratnu@samsung.com/467193002/1

[commit-bot: I haz the power, 2014-08-13 19:28:54]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[commit-bot: I haz the power, 2014-08-13 20:42:43]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-13 20:42:44]

Try jobs failed on following builders:
  win_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[tkent, 2014-08-14 00:35:54]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-08-14 00:36:22]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/sunil.ratnu@samsung.com/467193002/1

[commit-bot: I haz the power, 2014-08-14 00:37:30]

Committed patchset #1 (1) as 180218