Added input_method_util.h.

- Moved all functions in language_menu_l10n_util.h to the new file.
- Moved static methods in language_library.h and  language_config_model.h to the file.

BUG=none
TEST=try bot passed

Review URL: http://codereview.chromium.org/2810008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@50223 0039d316-1c4b-4281-b951-d872f2087c98
16 files changed