Get rid of extra NULL check when indexing CSSStyleDeclaration

Get rid of extra NULL check when indexing CSSStyleDeclaration

In order to minimize the performance impact of added UseCounters in
https://codereview.chromium.org/47923015, remove one superfluous NULL
check. We always NULL check propInfo before use anyway.

BUG=313864
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=162983

[davve, 2013-12-02 10:26:36]

Part of an effort to make PerformanceTests/CSS/CSSPropertyUpdateValue.html less
affected by added use counters (in https://codereview.chromium.org/47923015/).

Before:

avg 10173.585771733664 runs/s
median 10179.081709145536 runs/s
stdev 40.16915669136233 runs/s
min 10062.761238242889 runs/s
max 10233.232421589195 runs/s

After:

avg 10428.32807965403 runs/s
median 10433.713947139853 runs/s
stdev 22.437089028370586 runs/s
min 10383.04970788193 runs/s
max 10459.317398248682 runs/s

[davve, 2013-12-02 10:30:31]

On 2013/12/02 10:26:36, David Vest wrote:
> Before:
> 
> avg 10173.585771733664 runs/s
> median 10179.081709145536 runs/s
> stdev 40.16915669136233 runs/s
> min 10062.761238242889 runs/s
> max 10233.232421589195 runs/s
> 
> After:
> 
> avg 10428.32807965403 runs/s
> median 10433.713947139853 runs/s
> stdev 22.437089028370586 runs/s
> min 10383.04970788193 runs/s
> max 10459.317398248682 runs/s

The test is PerformanceTests/CSS/CSSPropertyUpdateValue.html btw.

[jochen (gone - plz use gerrit), 2013-12-02 10:47:40]

lgtm

[commit-bot: I haz the power, 2013-12-02 10:53:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/davve@opera.com/98793002/1

[commit-bot: I haz the power, 2013-12-02 11:56:27]

Change committed as 162983