Revert 232331 "It2Me native messaging: GYP and source refactoring"

> It2Me native messaging: GYP and source refactoring
> 
> 1. Add "me2me" to the names of all the me2me specific GYP targets and source files. This makes it easier for my next CL that will add the It2Me native messaging host component.
> 2. Create a remoting_native_messaging_base GYP target that contains the common native messaging plumbing code shared between remoting_core, remoting_me2me_native_messaging_host and the to-be-created remoting_it2me_native_messaging_host.
> 3. Clean up some dependencies in remoting.gyp: e.g. the native messaging manifest should be depended on by the archive targets, not the native messaging host binary targets.
> 4. Rename It2MeImpl to It2MeHost.
> 
> BUG=309844
> 
> Review URL: https://codereview.chromium.org/49113003

TBR=weitaosu@chromium.org

Review URL: https://codereview.chromium.org/50033003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232341 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232341