Use nullptr instead of 0 in WebAudio

Use nullptr instead of 0 in WebAudio

WebAudio uses 0 instead of nullptr in quite a few places. Update the code to
use nullptr.

BUG=455922
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=190881

[qi1988.yang, 2015-02-09 10:34:15]

qi1988.yang@samsung.com changed reviewers:
+ kbr@chromium.org, rtoy@chromium.org

[qi1988.yang, 2015-02-09 10:34:16]

Please take a look,thanks!

[Raymond Toy, 2015-02-09 19:21:24]

On 2015/02/09 10:34:16, qi1988.yang wrote:
> Please take a look,thanks!

Fix the typo in the description: "uses o instead"

If you're going to fix these, please fix the ones in platform/audio too.

[qi1988.yang, 2015-02-10 05:15:06]

Please take a look, thanks very much!

[Raymond Toy, 2015-02-10 16:59:27]

On 2015/02/10 05:15:06, qi1988.yang wrote:
> Please take a look, thanks very much!

Looks good. Did you run the webaudio layout tests? If not, can you run them or
at least send some tryjobs?

[qi1988.yang, 2015-02-11 07:09:19]

On 2015/02/10 16:59:27, Raymond Toy wrote:
> On 2015/02/10 05:15:06, qi1988.yang wrote:
> > Please take a look, thanks very much!
> 
> Looks good. Did you run the webaudio layout tests? If not, can you run them or
> at least send some tryjobs?

I have run the LayoutTests/webaudio. All cases except for
"biquad-getFrequencyResponse.html"  have passed.

The "biquad-getFrequencyResponse.html" layout test is also failed without my
patch.
Please confirm,thanks!

Another question: maybe the trybot is crashed. I can't verify the patch by doing
tryjobs.

[qi1988.yang, 2015-02-11 07:09:20]

On 2015/02/10 16:59:27, Raymond Toy wrote:
> On 2015/02/10 05:15:06, qi1988.yang wrote:
> > Please take a look, thanks very much!
> 
> Looks good. Did you run the webaudio layout tests? If not, can you run them or
> at least send some tryjobs?

I have run the LayoutTests/webaudio. All cases except for
"biquad-getFrequencyResponse.html"  have passed.

The "biquad-getFrequencyResponse.html" layout test is also failed without my
patch.
Please confirm,thanks!

Another question: maybe the trybot is crashed. I can't verify the patch by doing
tryjobs.

[Raymond Toy, 2015-02-11 17:57:05]

On 2015/02/11 07:09:20, qi1988.yang wrote:
> On 2015/02/10 16:59:27, Raymond Toy wrote:
> > On 2015/02/10 05:15:06, qi1988.yang wrote:
> > > Please take a look, thanks very much!
> > 
> > Looks good. Did you run the webaudio layout tests? If not, can you run them
or
> > at least send some tryjobs?
> 
> I have run the LayoutTests/webaudio. All cases except for
> "biquad-getFrequencyResponse.html"  have passed.
> 
> The "biquad-getFrequencyResponse.html" layout test is also failed without my
> patch.
> Please confirm,thanks!

Hmm. I don't have this problem on my Mac, without your patch.
> 
> Another question: maybe the trybot is crashed. I can't verify the patch by
doing
> tryjobs.

All the trybots are purple.  Can you run them again?

[qi1988.yang, 2015-02-12 02:48:30]

The CQ bit was checked by qi1988.yang@samsung.com

[commit-bot: I haz the power, 2015-02-12 02:49:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/906233002/20001

[commit-bot: I haz the power, 2015-02-12 02:49:02]

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

[commit-bot: I haz the power, 2015-02-12 02:49:03]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[qi1988.yang, 2015-02-12 02:49:23]

The CQ bit was unchecked by qi1988.yang@samsung.com

[qi1988.yang, 2015-02-12 03:14:36]

On 2015/02/11 17:57:05, Raymond Toy wrote:
> On 2015/02/11 07:09:20, qi1988.yang wrote:
> > On 2015/02/10 16:59:27, Raymond Toy wrote:
> > > On 2015/02/10 05:15:06, qi1988.yang wrote:
> > > > Please take a look, thanks very much!
> > > 
> > > Looks good. Did you run the webaudio layout tests? If not, can you run
them
> or
> > > at least send some tryjobs?
> > 
> > I have run the LayoutTests/webaudio. All cases except for
> > "biquad-getFrequencyResponse.html"  have passed.
> > 
> > The "biquad-getFrequencyResponse.html" layout test is also failed without my
> > patch.
> > Please confirm,thanks!
> 
> Hmm. I don't have this problem on my Mac, without your patch.
> > 
> > Another question: maybe the trybot is crashed. I can't verify the patch by
> doing
> > tryjobs.
> 
> All the trybots are purple.  Can you run them again?

Hi, Toy!
I don't have the Try job access right! So it shows purple.
Could you help me run the tryjobs?
Or help me to get the Trybot access right?
Thanks very much!

[qi1988.yang, 2015-02-12 03:14:37]

On 2015/02/11 17:57:05, Raymond Toy wrote:
> On 2015/02/11 07:09:20, qi1988.yang wrote:
> > On 2015/02/10 16:59:27, Raymond Toy wrote:
> > > On 2015/02/10 05:15:06, qi1988.yang wrote:
> > > > Please take a look, thanks very much!
> > > 
> > > Looks good. Did you run the webaudio layout tests? If not, can you run
them
> or
> > > at least send some tryjobs?
> > 
> > I have run the LayoutTests/webaudio. All cases except for
> > "biquad-getFrequencyResponse.html"  have passed.
> > 
> > The "biquad-getFrequencyResponse.html" layout test is also failed without my
> > patch.
> > Please confirm,thanks!
> 
> Hmm. I don't have this problem on my Mac, without your patch.
> > 
> > Another question: maybe the trybot is crashed. I can't verify the patch by
> doing
> > tryjobs.
> 
> All the trybots are purple.  Can you run them again?

Hi, Toy!
I don't have the Try job access right! So it shows purple.
Could you help me run the tryjobs?
Or help me to get the Trybot access right?
Thanks very much!

[qi1988.yang, 2015-02-13 06:21:08]

On 2015/02/12 03:14:37, qi1988.yang wrote:
> On 2015/02/11 17:57:05, Raymond Toy wrote:
> > On 2015/02/11 07:09:20, qi1988.yang wrote:
> > > On 2015/02/10 16:59:27, Raymond Toy wrote:
> > > > On 2015/02/10 05:15:06, qi1988.yang wrote:
> > > > > Please take a look, thanks very much!
> > > > 
> > > > Looks good. Did you run the webaudio layout tests? If not, can you run
> them
> > or
> > > > at least send some tryjobs?
> > > 
> > > I have run the LayoutTests/webaudio. All cases except for
> > > "biquad-getFrequencyResponse.html"  have passed.
> > > 
> > > The "biquad-getFrequencyResponse.html" layout test is also failed without
my
> > > patch.
> > > Please confirm,thanks!
> > 
> > Hmm. I don't have this problem on my Mac, without your patch.
> > > 
> > > Another question: maybe the trybot is crashed. I can't verify the patch by
> > doing
> > > tryjobs.
> > 
> > All the trybots are purple.  Can you run them again?
> 
> Hi, Toy!
> I don't have the Try job access right! So it shows purple.
> Could you help me run the tryjobs?
> Or help me to get the Trybot access right?
> Thanks very much!

The tryjobs of "blink_oilpan_dbg" run failed.
The error is introduced by the patch of 917013003 in r190080. And it has been
fixed two hours ago.
Please help me to run tryjobs again!
Thanks very much!

[Raymond Toy, 2015-02-13 17:18:10]

On 2015/02/13 06:21:08, qi1988.yang wrote:
> On 2015/02/12 03:14:37, qi1988.yang wrote:
> > On 2015/02/11 17:57:05, Raymond Toy wrote:
> > > On 2015/02/11 07:09:20, qi1988.yang wrote:
> > > > On 2015/02/10 16:59:27, Raymond Toy wrote:
> > > > > On 2015/02/10 05:15:06, qi1988.yang wrote:
> > > > > > Please take a look, thanks very much!
> > > > > 
> > > > > Looks good. Did you run the webaudio layout tests? If not, can you run
> > them
> > > or
> > > > > at least send some tryjobs?
> > > > 
> > > > I have run the LayoutTests/webaudio. All cases except for
> > > > "biquad-getFrequencyResponse.html"  have passed.
> > > > 
> > > > The "biquad-getFrequencyResponse.html" layout test is also failed
without
> my
> > > > patch.
> > > > Please confirm,thanks!
> > > 
> > > Hmm. I don't have this problem on my Mac, without your patch.
> > > > 
> > > > Another question: maybe the trybot is crashed. I can't verify the patch
by
> > > doing
> > > > tryjobs.
> > > 
> > > All the trybots are purple.  Can you run them again?
> > 
> > Hi, Toy!
> > I don't have the Try job access right! So it shows purple.
> > Could you help me run the tryjobs?
> > Or help me to get the Trybot access right?
> > Thanks very much!
> 
> The tryjobs of "blink_oilpan_dbg" run failed.
> The error is introduced by the patch of 917013003 in r190080. And it has been
> fixed two hours ago.
> Please help me to run tryjobs again!
> Thanks very much!

The other bots passed, so I think we're good.

[Raymond Toy, 2015-02-13 17:18:59]

lgtm

[qi1988.yang, 2015-02-25 02:00:27]

Excuse me, kbr! 
PTAL! Thanks very much!

[Ken Russell (switch to Gerrit), 2015-02-25 19:25:45]

lgtm

[qi1988.yang, 2015-02-26 02:02:59]

The CQ bit was checked by qi1988.yang@samsung.com

[commit-bot: I haz the power, 2015-02-26 02:03:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/906233002/20001

[commit-bot: I haz the power, 2015-02-26 02:37:24]

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

[commit-bot: I haz the power, 2015-02-26 02:37:26]

Try jobs failed on following builders:
  mac_blink_compile_dbg on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/mac_blink_compile_dbg/bu...)

[qi1988.yang, 2015-02-26 02:46:16]

The CQ bit was checked by qi1988.yang@samsung.com

[qi1988.yang, 2015-02-26 02:46:17]

The patchset sent to the CQ was uploaded after l-g-t-m from kbr@chromium.org,
rtoy@chromium.org
Link to the patchset: https://codereview.chromium.org/906233002/#ps40001 (title:
"rebase")

[commit-bot: I haz the power, 2015-02-26 02:47:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/906233002/40001

[qi1988.yang, 2015-02-26 08:10:32]

The CQ bit was unchecked by qi1988.yang@samsung.com

[qi1988.yang, 2015-02-26 08:10:33]

The CQ bit was checked by qi1988.yang@samsung.com

[commit-bot: I haz the power, 2015-02-26 08:11:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/906233002/40001

[commit-bot: I haz the power, 2015-02-26 09:12:02]

Committed patchset #3 (id:40001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=190881