Remove NodeAllocatorInterface NodeAllocatorInterface is no longer necessary thanks to r547 (so far it was used in DictionaryInterface but it no longer exists). This is just an internal clean-up. No user-visible behavior change is intended. Patch from Noriyuki Takahashi. BUG=none TEST=unittest git-svn-id: http://mozc.googlecode.com/svn/trunk@548 a6090854-d499-a067-5803-1114d4e51264