Remove unneeded #define in ref_counted.h

Remove unneeded #define in ref_counted.h

Now that the implicit conversion to T* can be removed, the preprocessor
define DISABLE_SCOPED_REFPTR_CONVERSION_OPERATOR is no longer needed.

BUG=110610
Committed: https://crrev.com/e699b92b064e51a5ffa57debbd5e2e260558b32d
Cr-Commit-Position: refs/heads/master@{#305591}

[dcheng, 2014-11-25 02:54:56]

dcheng@chromium.org changed reviewers:
+ thakis@chromium.org

[Nico, 2014-11-25 02:59:10]

lgtm!

https://codereview.chromium.org/759503002/diff/1/base/memory/ref_counted.h
File base/memory/ref_counted.h (right):

https://codereview.chromium.org/759503002/diff/1/base/memory/ref_counted.h#ne...
base/memory/ref_counted.h:380: // Temporary operator overloads to facilitate the
transition...
Should this have a link to the bug?

[dcheng, 2014-11-25 03:00:46]

The CQ bit was checked by dcheng@chromium.org

[dcheng, 2014-11-25 03:00:47]

https://codereview.chromium.org/759503002/diff/1/base/memory/ref_counted.h
File base/memory/ref_counted.h (right):

https://codereview.chromium.org/759503002/diff/1/base/memory/ref_counted.h#ne...
base/memory/ref_counted.h:380: // Temporary operator overloads to facilitate the
transition...
On 2014/11/25 at 02:59:10, Nico wrote:
> Should this have a link to the bug?

Done.

[commit-bot: I haz the power, 2014-11-25 03:01:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/759503002/20001

[commit-bot: I haz the power, 2014-11-25 05:41:03]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-11-25 05:42:31]

Patchset 2 (id:??) landed as
https://crrev.com/e699b92b064e51a5ffa57debbd5e2e260558b32d
Cr-Commit-Position: refs/heads/master@{#305591}