Fix the default pref value for Korean Serif font

There's a typo; Noto CJK Serif KR => Noto Serif CJK KR

BUG=None
TEST=data:text/html,<span style="serif" lang="ko">Abc</span> is rendered
with Noto Serif CJK KR when inspected in the DOM inspector.
TBR=derat@chromium.org

Change-Id: I2938e91ba7d0936e1cfa898168331fe22776511a
Reviewed-on: https://chromium-review.googlesource.com/673828Reviewed-by: Jungshik Shin <jshin@chromium.org>
Commit-Queue: Jungshik Shin <jshin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502968}

chrome/app/resources/locale_settings_google_chromeos.grd

@@ -209,7 +209,7 @@
       <!-- The default value for |WebPreference::serif_font_family_map| for
            Korean script. -->
       <message name="IDS_SERIF_FONT_FAMILY_KOREAN" use_name_for_id="true">
-        Noto CJK Serif KR
+        Noto Serif CJK KR
       </message>
 
       <!-- The default value for |WebPreference::sans_serif_font_family_map| for