Rename base::ScopedPtrAlignedFree to AlignedFreeDeleter.

(The new name is consistent with base::FreeDeleter.)

Also, update comments to refer to scoped_ptr rather than the deprecated
scoped_ptr_malloc, and convert scoped_ptr_malloc<...,
ScopedPtrAlignedFree> to scoped_Ptr<..., AlignedFreeDeleter>.

R=brettw@chromium.org, dalecurtis@chromium.org, piman@chromium.org, brettw
TBR=piman, tyoshino

Review URL: https://codereview.chromium.org/167663002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251586 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251586