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 bool SetImeConfig(const std::string& section,
                             const std::string& config_name,
                            const input_method::ImeConfigValue& value) {
     return false;
   }

   virtual bool SetImeConfig(const std::string& section,
                             const std::string& config_name,
                            const ImeConfigValue& value) {
     return false;
   }
