Updates the input method name string for the new Korean IME.

BUG=None
TEST=Verified on linux_chromeos.
TBR=nona@chromium.org

Review URL: https://codereview.chromium.org/1004033008

Cr-Commit-Position: refs/heads/master@{#320876}

chrome/app/chromeos_strings.grdp

@@ -4987,7 +4987,7 @@ Battery full
     Zhuyin input method
   </message>
   <message name="IDS_IME_NAME_INPUTMETHOD_HANGUL" desc="The input method name shows in system tray menu, this is Korean Hangul input method.">
-    Hangul input method
+    Korean input method
   </message>
   <message name="IDS_IME_NAME_INPUTMETHOD_HANGUL_2_SET" desc="The input method name shows in system tray menu, this is Korean Hangul input method, 2 Set mode.">
     Hangul 2 Set