Avoid use of Object.keys() [corrected]

[hiroshi-maybe]

Avoid use of Object.create() to keep code consistency for iteration of object properties.

[staabm]

Did you perf test the change? Usually You also need to open a bugtracker ticket

[timmywil]

An associated ticket on the bug tracker is necessary.

For more information, see the contributing guidelines.

[timmywil]

Also, I think you meant Object.keys.

[markelog]

/cc @rwaldron

[hiroshi-maybe]

Thanks for comments! I opened a ticket in bugtracker. http://bugs.jquery.com/ticket/14659
I will recreate a patch to modify wrong commit log if change is accepted.

@staabm Thanks for confirmation. No errors are found in Test Suite. Also I verified that event listeners were removed in my simple test case.

[rwaldron]

The change works fine, but I don't like the rationale given in the ticket.

@K-ori considering my response here: http://bugs.jquery.com/ticket/14659#comment:1, can you provide evidence of a performance improvement?

[hiroshi-maybe]

[Performance]
I created jsperf benchmark. for-in was faster if hasOwnProperty() is not called (Chrome 31.0/Safari 6.0.5 on OS X 10.8.5).
http://jsperf.com/enumerate-properties

[File size]
for-in is smaller than Object.create(). I quote snippet of build script.

master branch

raw	gz	minify
245170	72599	dist/jquery.js
83790	29329	dist/jquery.min.js

patched branch

raw	gz	minify
245096	72570	dist/jquery.js
83743	29307	dist/jquery.min.js

Compared to master @ 537e9ce

raw	gz	minify
-209	-53	dist/jquery.js
-111	-29	dist/jquery.min.js

[dmethvin]

It looks like we're just backing out the change from c1b8edf, which is fine with me if it saves bytes.

[dmethvin]

@mzgol addressed this with a slightly different patch in a96d5be . Thanks for pointint this out @K-ori !