Consistently use WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS for ALLOW_ONLY_INLINE_ALLOCATION objects

Currently we mix WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS, SimpleClassVectorTraits and
hand-written vector traits for ALLOW_ONLY_INLINE_ALLOCATION objects.
This CL unifies them into WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS macros.

BUG=340522

Review URL: https://codereview.chromium.org/361693002

git-svn-id: svn://svn.chromium.org/blink/trunk@177191 bbb929c8-8fbe-4397-9dbb-9b2b20218538