Rework startup-data-util.

Rework startup-data-util.

- Make the API look like v8::V8::InitializeICU.
  (That is: A static method call, not an object to be created on the stack.)
- Fix path separator on Windows, by calling base::OS::isPathSeparator.
- Move into API, so that it can be called by hello-world & friends.
- Actually call it from hello-world and friends.

R=jochen@chromium.org
BUG=

Committed: https://crrev.com/c69e2eae548d4a68bb1b91032e9825709155a8c5
Cr-Commit-Position: refs/heads/master@{#30174}

[vogelheim, 2015-08-13 14:54:59]

Patchset #1 (id:1) has been deleted

[vogelheim, 2015-08-13 15:20:37]

Please have a look.

- Breakage on v8_linux64_avx2_rel looks unrelated.
- The 2nd patch set is there to ensure I'm try-bot testing it on all platforms.
Actually enabling on all platforms should be a 2nd Cl, though.

[jochen (gone - plz use gerrit), 2015-08-13 15:21:52]

jochen@chromium.org changed reviewers:
+ epertoso@chromium.org

[jochen (gone - plz use gerrit), 2015-08-13 15:21:52]

lgtm so far

[vogelheim, 2015-08-14 11:29:02]

Patchset #3 (id:60001) has been deleted

[vogelheim, 2015-08-14 11:49:17]

On 2015/08/13 15:21:52, jochen (ooo) wrote:
> lgtm so far

Will commit.

The rebase + back-and-forth with 'all platforms' makes this look a bit odd, but
the only change versus the lgtm-ed "Patch Set 1" is a one-line change in
startup-data-util.cc.

Also, this should revert cleanly (discussed w/ hablich@ because of API freeze).

[vogelheim, 2015-08-14 11:49:21]

The CQ bit was checked by vogelheim@chromium.org

[vogelheim, 2015-08-14 11:49:21]

The patchset sent to the CQ was uploaded after l-g-t-m from jochen@chromium.org
Link to the patchset: https://codereview.chromium.org/1292053002/#ps100001
(title: "Same as Patch Set 3, but revert the "Test for all platforms" bits.")

[commit-bot: I haz the power, 2015-08-14 11:49:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1292053002/100001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1292053002/100001

[commit-bot: I haz the power, 2015-08-14 12:11:36]

Committed patchset #4 (id:100001)

[commit-bot: I haz the power, 2015-08-14 12:11:55]

Patchset 4 (id:??) landed as
https://crrev.com/c69e2eae548d4a68bb1b91032e9825709155a8c5
Cr-Commit-Position: refs/heads/master@{#30174}