Have Frame::loader() return a reference

Have Frame::loader() return a reference

Have Frame::loader() return a reference instead of a pointer as it can never
return null. This makes the calling code look safer and gets rid of several
unnecessary null checks.

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=160365

[adamk, 2013-10-23 17:47:03]

wow that's a big one. rs=me, lgtm

btw, I got abarth to add me to Source/web/OWNERS so you should be good to submit
with just my lgtm

[Inactive, 2013-10-23 17:57:54]

On 2013/10/23 17:47:03, adamk wrote:
> wow that's a big one. rs=me, lgtm
> 
> btw, I got abarth to add me to Source/web/OWNERS so you should be good to
submit
> with just my lgtm

I still need an OWNER for Source/modules to take a look :)

[abarth-chromium, 2013-10-23 18:33:49]

rs=me LGTM

[commit-bot: I haz the power, 2013-10-23 18:35:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/31063004/1

[commit-bot: I haz the power, 2013-10-23 19:34:04]

Change committed as 160365