Change kB to KB for consistency.

ui/base/strings/ui_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. Specifically, these are UI strings that are used by app/ that
 need to be translated for each locale.-->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <!-- TODO add each of your output files.  Modify the three below, and add
@@ skipping 325 matching lines @@
       </message>
       <message name="IDS_APP_SHIFT_MODIFIER" desc="Shift key shortcut modifier">
         Shift+<ph name="KEY_COMBO_NAME">$1<ex>C</ex></ph>
       </message>
 
       <!-- Byte size units -->
       <message name="IDS_APP_BYTES" desc="Units tag indicating a quantity of bytes">
         <ph name="QUANTITY">$1<ex>42</ex></ph> B
       </message>
       <message name="IDS_APP_KIBIBYTES" desc="Units tag indicating a quantity of kilobytes">
-        <ph name="QUANTITY">$1<ex>42.0</ex></ph> kB
+        <ph name="QUANTITY">$1<ex>42.0</ex></ph> KB
       </message>
       <message name="IDS_APP_MEBIBYTES" desc="Units tag indicating a quantity of megabytes">
         <ph name="QUANTITY">$1<ex>42.0</ex></ph> MB
       </message>
       <message name="IDS_APP_GIBIBYTES" desc="Units tag indicating a quantity of gigabytes">
         <ph name="QUANTITY">$1<ex>42.0</ex></ph> GB
       </message>
       <message name="IDS_APP_TEBIBYTES" desc="Units tag indicating a quantity of terabytes">
         <ph name="QUANTITY">$1<ex>42.0</ex></ph> TB
       </message>
       <message name="IDS_APP_PEBIBYTES" desc="Units tag indicating a quantity of petabytes">
         <ph name="QUANTITY">$1<ex>42.0</ex></ph> PB
       </message>
       <message name="IDS_APP_BYTES_PER_SECOND" desc="Units tag indicating a speed of bytes/second">
         <ph name="QUANTITY">$1<ex>42</ex></ph> B/s
       </message>
       <message name="IDS_APP_KIBIBYTES_PER_SECOND" desc="Units tag indicating a speed of kilobytes/second">
-        <ph name="QUANTITY">$1<ex>42.0</ex></ph> kB/s
+        <ph name="QUANTITY">$1<ex>42.0</ex></ph> KB/s
       </message>
       <message name="IDS_APP_MEBIBYTES_PER_SECOND" desc="Units tag indicating a speed of megabytes/second">
         <ph name="QUANTITY">$1<ex>42.0</ex></ph> MB/s
       </message>
       <message name="IDS_APP_GIBIBYTES_PER_SECOND" desc="Units tag indicating a speed of gigabytes/second">
         <ph name="QUANTITY">$1<ex>42.0</ex></ph> GB/s
       </message>
       <message name="IDS_APP_TEBIBYTES_PER_SECOND" desc="Units tag indicating a speed of terabytes/second">
         <ph name="QUANTITY">$1<ex>42.0</ex></ph> TB/s
       </message>
       <message name="IDS_APP_PEBIBYTES_PER_SECOND" desc="Units tag indicating a speed of petabytes/second">
         <ph name="QUANTITY">$1<ex>42.0</ex></ph> PB/s
       </message>
     </messages>
   </release>
 </grit>