Remove fast path checks that look into the Groups in ComputedStyle

Remove fast path checks that look into the Groups in ComputedStyle

BUG=

[nainar, 2017-04-10 22:53:24]

The CQ bit was checked by nainar@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-10 22:53:54]

Dry run: 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, 2017-04-10 23:04:13]

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

[commit-bot: I haz the power, 2017-04-10 23:04:13]

Dry run: Try jobs failed on following builders:
  cast_shell_linux on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/cast_shell_linu...)

[nainar, 2017-04-11 19:52:00]

The CQ bit was checked by nainar@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-11 19:52:50]

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

[nainar, 2017-04-11 20:01:55]

nainar@chromium.org changed reviewers:
+ shend@chromium.org

[nainar, 2017-04-11 20:01:56]

Running the perf bots here as an FYI

[commit-bot: I haz the power, 2017-04-11 20:50:40]

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

[commit-bot: I haz the power, 2017-04-11 20:50:41]

Dry run: Try jobs failed on following builders:
  linux_android_rel_ng on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/linux_androi...)

[nainar, 2017-04-11 21:02:07]

On 2017/04/11 at 20:01:56, nainar wrote:
> Running the perf bots here as an FYI

Or not the perf bots wont run - hmm

[shend, 2017-04-12 01:02:53]

Hmm, that's weird, have you tried other perf bots?
Moving myself to cc so it doesn't show up on the dashboard :P

[shend, 2017-04-12 01:03:03]

shend@chromium.org changed reviewers:
- shend@chromium.org

[nainar, 2017-04-12 02:54:56]

On 2017/04/12 at 01:02:53, shend wrote:
> Hmm, that's weird, have you tried other perf bots?
> Moving myself to cc so it doesn't show up on the dashboard :P

I have yup :/

[shend, 2017-04-12 02:58:08]

On 2017/04/12 at 02:54:56, nainar wrote:
> On 2017/04/12 at 01:02:53, shend wrote:
> > Hmm, that's weird, have you tried other perf bots?
> > Moving myself to cc so it doesn't show up on the dashboard :P
> 
> I have yup :/

Also, it's a bit weird that layout tests are failing...

[shend, 2017-04-12 03:12:42]

shend@chromium.org changed reviewers:
+ shend@chromium.org

[shend, 2017-04-12 03:12:43]

https://codereview.chromium.org/2813563005/diff/20001/third_party/WebKit/Sour...
File third_party/WebKit/Source/core/style/ComputedStyle.cpp (left):

https://codereview.chromium.org/2813563005/diff/20001/third_party/WebKit/Sour...
third_party/WebKit/Source/core/style/ComputedStyle.cpp:910: *background_ !=
*other.background_)
I think it's fine to keep this, since dereferencing background would return a
StyleBackgroundData and use the == operator on it with no fast path. If you want
to change it, it should be "||" not "&&" I think.

[nainar, 2017-04-12 07:14:27]

The CQ bit was checked by nainar@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-12 07:14:45]

Dry run: 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, 2017-04-12 10:05:20]

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

[commit-bot: I haz the power, 2017-04-12 10:05:21]

Dry run: Try jobs failed on following builders:
  linux_chromium_asan_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)