Rename 'UseCounter::observe' to 'UseCounter::count'.

Rename 'UseCounter::observe' to 'UseCounter::measureFeature'.

Observation is a leftover concept from the class's old name ("FeatureObserver")
and doesn't make much sense in the new class. Renaming the methods to
"count" and "countDeprecation" seems more clear.

This mechanical patch was brought to you by 'sed', 'ack', and the letter 'e'.

BUG=233522
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=149193

[eseidel, 2013-04-26 09:23:54]

Fine with me.  I'm not sure these need to say "Feature" in the name since I can
imagine some of these feeling more fine grained than "features", but OK.

[eseidel, 2013-04-26 09:24:32]

We could also all it "count" :)  or "record".  I really don't have strong
feelings here.

[eseidel, 2013-04-26 09:24:51]

lgtm

rs=me.

[Mike West, 2013-04-26 09:38:14]

On 2013/04/26 09:24:51, Eric Seidel (Google) wrote:
> lgtm
> 
> rs=me.

Let's run with 'count' and 'countDeprecation' for the moment. If those turn out
to be confusing or hated, I'll rename them again. :)

Thanks!

[commit-bot: I haz the power, 2013-04-26 09:45:18]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mkwst@chromium.org/14070021/5001

[commit-bot: I haz the power, 2013-04-26 10:41:33]

Retried try job too often on win_layout_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_layout...

[commit-bot: I haz the power, 2013-04-26 11:22:20]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mkwst@chromium.org/14070021/6022

[Mike West, 2013-04-26 11:44:04]

Committed patchset #3 manually as r149193 (presubmit successful).