Rewrite scoped_ptr<T>(NULL) to use the default ctor.

Rewrite scoped_ptr<T>(NULL) to use the default ctor. 

This is a manual cleanup of call sites that invoke scoped_ptr<T>'s
constructor with an explicit NULL argument, since the clang tooling
infrastructure does not work on Windows. Also fixes a misuse of
scoped_ptr<T> in chrome_frame to hold memory allocated by operator
new[].

BUG=173286
R=alexeypa@chromium.org, erg@chromium.org, jochen@chromium.org, mmenke@chromium.org, tommi@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=206763

[dcheng, 2013-06-17 03:28:05]

tommi@ for chrome_frame/ and media/audio/
mmenke@ for chrome/browser/profiles/ and net/
jochen@ for content/browser/web_contents/
garykac@ for remoting/

[alexeypa (please no reviews), 2013-06-17 05:37:37]

remoting/ - lgtm

[jochen (gone - plz use gerrit), 2013-06-17 07:28:57]

content/browser/web_contents lgtm

[tommi (sloooow) - chröme, 2013-06-17 11:59:48]

lgtm

[mmenke, 2013-06-17 14:55:38]

On 2013/06/17 11:59:48, tommi wrote:
> lgtm

I'm only an owner of the profiles/ code that lives on the IO thread, so you'll
need another OWNER for that.

net/ LGTM.

[dcheng, 2013-06-17 14:57:55]

erg@, mind rubberstamping the changes in chrome/browser/profiles? Thanks!

[Elliot Glaysher, 2013-06-17 17:09:55]

lgtm

[dcheng, 2013-06-17 18:46:56]

Committed patchset #1 manually as r206763 (presubmit successful).