[SystemInfo API] Rename systemInfo Memory API.

[SystemInfo API] Rename systemInfo Memory API.

Rename from "systemInfo.memory.get" to "system.memory.getInfo".

This is a reland commit of issue 18863014(https://codereview.chromium.org/1886314）
There is nothing wrong of the previous patch, so this commit is just a copy.

The previous patch got a bad revert since there was a bug on Mac buildbot before.

BUG=252994
TEST=update system.memory API browser_tests and pass through

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=213127

[Haojian Wu, 2013-07-21 15:29:18]

A new copied CL from the previous CL https://codereview.chromium.org/18863014/. 

The previous CL has been reverted(see https://codereview.chromium.org/18863014/)
since it broke browser_tests on Mac buildbot. The log says
SystemInfoMemoryApiTest.Memory fails. And I have double checked this CL and make
sure that this CL has renamed from "SystemInfoMemoryApiTest.Memory" to
"SystemMemoryApiTest.Memory".

This new CL has nothing changed except some rebasing. Please review it again.
Thanks.

[Hongbo Min, 2013-07-22 01:40:21]

On 2013/07/21 15:29:18, Haojian Wu wrote:
> A new copied CL from the previous CL
https://codereview.chromium.org/18863014/. 
> 
> The previous CL has been reverted(see
https://codereview.chromium.org/18863014/)
> since it broke browser_tests on Mac buildbot. The log says
> SystemInfoMemoryApiTest.Memory fails. And I have double checked this CL and
make
> sure that this CL has renamed from "SystemInfoMemoryApiTest.Memory" to
> "SystemMemoryApiTest.Memory".
> 
> This new CL has nothing changed except some rebasing. Please review it again.
> Thanks.

kalman@, could you please help try Mac buildbot?

[Haojian Wu, 2013-07-22 13:39:10]

On 2013/07/22 01:40:21, Hongbo Min wrote:
> On 2013/07/21 15:29:18, Haojian Wu wrote:
> > A new copied CL from the previous CL
> https://codereview.chromium.org/18863014/. 
> > 
> > The previous CL has been reverted(see
> https://codereview.chromium.org/18863014/)
> > since it broke browser_tests on Mac buildbot. The log says
> > SystemInfoMemoryApiTest.Memory fails. And I have double checked this CL and
> make
> > sure that this CL has renamed from "SystemInfoMemoryApiTest.Memory" to
> > "SystemMemoryApiTest.Memory".
> > 
> > This new CL has nothing changed except some rebasing. Please review it
again.
> > Thanks.
> 
> kalman@, could you please help try Mac buildbot?

Vladislav@ has confirmed that there is a bug on Mac buildbot before this patch
got landed. So there is nothing wrong with this patch. Please LGTM again.
Thanks.

[Hongbo Min, 2013-07-22 13:48:34]

lgtm

[not at google - send to devlin, 2013-07-22 14:41:08]

Can the sheriff revert the bad revert? A separate CL loses history.

But whatever, lgtm, but please mention in the commit message that this is a
reland and why.

[Haojian Wu, 2013-07-22 15:28:38]

On 2013/07/22 14:41:08, kalman wrote:
> Can the sheriff revert the bad revert? A separate CL loses history.
> 
> But whatever, lgtm, but please mention in the commit message that this is a
> reland and why.

Done.

[Ilya Sherman, 2013-07-23 00:21:25]

LGTM

[commit-bot: I haz the power, 2013-07-23 00:54:10]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/Hokein.Wu@gmail.com/19912002/7001

[commit-bot: I haz the power, 2013-07-23 02:52:15]

Retried try job too often on mac_rel for step(s) sync_integration_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2013-07-23 09:20:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/Hokein.Wu@gmail.com/19912002/7001

[commit-bot: I haz the power, 2013-07-23 10:10:42]

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

[commit-bot: I haz the power, 2013-07-23 15:07:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/Hokein.Wu@gmail.com/19912002/7001

[commit-bot: I haz the power, 2013-07-23 15:35:41]

Change committed as 213127