Drop Big5-HKSCS and add IBM866 in the encoding menu.

chrome/app/chrome_command_ids.h

Index: chrome/app/chrome_command_ids.h
diff --git a/chrome/app/chrome_command_ids.h b/chrome/app/chrome_command_ids.h
index cd11b91bb6f4b299d89e823260a981fa263f5711..fab2bc2f7965880b6fc990c2abb2f32635966633 100644
--- a/chrome/app/chrome_command_ids.h
+++ b/chrome/app/chrome_command_ids.h
@@ -98,7 +98,6 @@
 #define IDC_ENCODING_GBK                35505
 #define IDC_ENCODING_GB18030            35506
 #define IDC_ENCODING_BIG5               35507
-#define IDC_ENCODING_BIG5HKSCS          35508
 #define IDC_ENCODING_KOREAN             35509

[sky, 2015/03/21 16:07:56]

Is there a reason you don't want adjust subsequent commands so we don't have any
holes?

[jungshik at Google, 2015/03/23 19:36:17]

Initially, I thought that it'd lower the chance of a profile "conflict" between
versions, but it should not matter because the preferred encoding is stored as a
string (if somebody sets it to Big5HKSCS, which is very unlikely).  

I'll just remove the holes (there's one more hole created when removing
ISO-8859-1). 

 #define IDC_ENCODING_SHIFTJIS           35510
 #define IDC_ENCODING_ISO2022JP          35511
@@ -128,6 +127,7 @@
 #define IDC_ENCODING_WINDOWS1255        35535
 #define IDC_ENCODING_WINDOWS1258        35536
 #define IDC_ENCODING_ISO88598I          35537
+#define IDC_ENCODING_IBM866             35538
 
 // Clipboard commands
 #define IDC_CUT                         36000