Remove use of libcros from InputMethodLibrary.

BUG=chromium-os:16238
TEST==confirm that input methods work as before on the netbook. Also confirm that the chrome builds and works on the desktop as before.

Review URL: http://codereview.chromium.org/7003086

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89142 0039d316-1c4b-4281-b951-d872f2087c98
  virtual InputMethodDescriptor current_input_method() const {
  virtual input_method::InputMethodDescriptor current_input_method() const {
     if (current_input_method_.id.empty()) {
       return input_method::GetFallbackInputMethodDescriptor();
     }
     return current_input_method_;
   }

  virtual InputMethodDescriptor current_input_method() const {
     if (current_input_method_.id.empty()) {
       return input_method::GetFallbackInputMethodDescriptor();
     }
     return current_input_method_;
   }
