Oilpan: add Member<T>(RawPtr<U>) constructor.

Oilpan: add Member<T>(RawPtr<U>) constructor.

r170929 introduced code that constructs a std::pair with a transition
type of OwnPtrWillBeMember<T> as the second component, from a value
having the transition type OwnPtrWillBeRawPtr<T>. With Oilpan enabled,
this requires an implicit conversion from RawPtr<T> to Member<T>,
which isn't supported. Introduce it here by adding a Member<T>
constructor from a given RawPtr<>.

R=
BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170942

[sof, 2014-04-06 21:35:40]

Please take a look.

Addressing the ToT compile failure with Oilpan enabled.

(Verified to build ok locally with clang, vc2013 and g++-4.7.)

[haraken, 2014-04-07 00:39:03]

LGTM

[haraken, 2014-04-07 04:00:18]

The CQ bit was checked by haraken@chromium.org

[commit-bot: I haz the power, 2014-04-07 04:00:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sigbjornf@opera.com/225303010/1

[commit-bot: I haz the power, 2014-04-07 04:09:54]

Change committed as 170942

[sof, 2014-04-07 05:38:42]

Forgot to mention -- ToT compiled with g++-4.7 before this, but not with clang
and vc2013. 

The reason being, I suspect, that its std::pair is not that far along to c++11
and its use of "rvalue references" for make_pair(). But didn't chase down fully.