Move TestExtraData classes to anonymous namespace.

Move TestExtraData classes to anonymous namespace.

We were previously declaring two different classes with the name
blink::TestExtraData, which is an ODR violation. As it happens,
their implementations compiled to the same machine code, which
allowed the tests to pass in most normal circumstances. However,
the ODR violation causes test failures in CFI mode (e.g. [1]) as a
result of stricter type checking. The fix is to move both classes to
an anonymous namespace which makes them internal to their TUs.

[1] https://build.chromium.org/p/chromium.fyi/builders/CFI%20Linux/builds/5924/steps/webkit_unit_tests/logs/WebURLResponseTest.ExtraData

BUG=464797
R=thakis@chromium.org

Committed: https://crrev.com/2a76d152793a2d3a7d89f26912d2af2ca31a2335
Cr-Commit-Position: refs/heads/master@{#403338}

[Nico, 2016-06-30 22:15:45]

lgtm

[pcc1, 2016-06-30 22:16:21]

The CQ bit was checked by pcc@chromium.org

[commit-bot: I haz the power, 2016-06-30 22:17:12]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-30 23:34:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-30 23:34:20]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-06-30 23:37:24]

Description was changed from

==========
Move TestExtraData classes to anonymous namespace.

We were previously declaring two different classes with the name
blink::TestExtraData, which is an ODR violation. As it happens,
their implementations compiled to the same machine code, which
allowed the tests to pass in most normal circumstances. However,
the ODR violation causes test failures in CFI mode (e.g. [1]) as a
result of stricter type checking. The fix is to move both classes to
an anonymous namespace which makes them internal to their TUs.

[1]
https://build.chromium.org/p/chromium.fyi/builders/CFI%20Linux/builds/5924/st...

BUG=464797
R=thakis@chromium.org
==========

to

==========
Move TestExtraData classes to anonymous namespace.

We were previously declaring two different classes with the name
blink::TestExtraData, which is an ODR violation. As it happens,
their implementations compiled to the same machine code, which
allowed the tests to pass in most normal circumstances. However,
the ODR violation causes test failures in CFI mode (e.g. [1]) as a
result of stricter type checking. The fix is to move both classes to
an anonymous namespace which makes them internal to their TUs.

[1]
https://build.chromium.org/p/chromium.fyi/builders/CFI%20Linux/builds/5924/st...

BUG=464797
R=thakis@chromium.org

Committed: https://crrev.com/2a76d152793a2d3a7d89f26912d2af2ca31a2335
Cr-Commit-Position: refs/heads/master@{#403338}
==========

[commit-bot: I haz the power, 2016-06-30 23:37:25]

Patchset 1 (id:??) landed as
https://crrev.com/2a76d152793a2d3a7d89f26912d2af2ca31a2335
Cr-Commit-Position: refs/heads/master@{#403338}