Remove legacy PDF JSON interface.

chrome/browser/resources/chromeos/chromevox/strings/chromevox_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <grit base_dir="." current_release="1" enc_check="möl" latest_public_release="0" source_lang_id="en">
   <outputs>
     <output filename="_locales/am/messages.json" type="chrome_messages_json" lang="am"/>
     <output filename="_locales/ar/messages.json" type="chrome_messages_json" lang="ar"/>
     <output filename="_locales/bg/messages.json" type="chrome_messages_json" lang="bg"/>
     <output filename="_locales/bn/messages.json" type="chrome_messages_json" lang="bn"/>
     <output filename="_locales/ca/messages.json" type="chrome_messages_json" lang="ca"/>
     <output filename="_locales/cs/messages.json" type="chrome_messages_json" lang="cs"/>
@@ skipping 1712 matching lines @@
       </message>
       <message desc="Verbal indication of no more different elements." name="IDS_CHROMEVOX_NO_MORE_DIFFERENT_ELEMENTS">
         No more different elements.
       </message>
       <message desc="Description of the enter group exploration user command. Displayed in the Options page." name="IDS_CHROMEVOX_ENTER_CSS_SPACE">
         Enter group exploration
       </message>
       <message desc="Spoken when entering group exploration." name="IDS_CHROMEVOX_ENTER_GROUP_EXPLORATION">
         Exploring groups
       </message>
-      <message desc="A message displayed at the top of PDF files where text has been automatically extracted for accessibility." name="IDS_CHROMEVOX_PDF_HEADER">
-        This page contains the text automatically extracted from the PDF file &lt;b&gt;<ph name="filename">$1</ph>&lt;/b&gt;. &lt;a href="<ph name="url">$2</ph>"&gt;Click here for the original.&lt;/a&gt;
-      </message>
       <message desc="A message spoken when the user switches to the object granularity, which allows users to navigate the page by objects." name="IDS_CHROMEVOX_OBJECT_STRATEGY">
         Object
       </message>
       <message desc="A message spoken when the user switches to the group granularity, which allows users to navigate the page by groups." name="IDS_CHROMEVOX_GROUP_STRATEGY">
         Group
       </message>
       <message desc="A message spoken when the user switches to the table granularity, which allows users to navigate within a group." name="IDS_CHROMEVOX_TABLE_STRATEGY">
         Table
       </message>
       <message desc="A message spoken when the user switches to the row granularity, which allows users to navigate within a table." name="IDS_CHROMEVOX_ROW_GRANULARITY">
@@ skipping 600 matching lines @@
       </message>
       <message desc="Describes the braille caption feature. Braille captioning provides an overlay showing both text and braille of what ChromeVox would show on a refreshable braille display. Shown in the options page as a label." name="IDS_CHROMEVOX_BRAILLE_CAPTIONS">
         Toggle braille captions
       </message>
       <message desc="Spoken and brailled when the braille captions feature is enabled. This feature shows the braille output in a small overlay on the screen for development and demonstration purposes." name="IDS_CHROMEVOX_BRAILLE_CAPTIONS_ENABLED">
         Braille captions enabled.
       </message>
       <message desc="Spoken and brailled when the braille captions feature is disabled. This feature shows the braille output in a small overlay on the screen for development and demonstration purposes." name="IDS_CHROMEVOX_BRAILLE_CAPTIONS_DISABLED">
         Braille captions disabled.
       </message>
-      <message desc="Message displayed and spoken to user if they open a copy-protected PDF and the browser is unable to offer accessible text." name="IDS_CHROMEVOX_COPY_PROTECTED_PDF">
-        Unable to access accessible text from copy-protected PDF.
-      </message>
       <message desc="Message spoken to user when switching to a mode where searching is not case-sensitive." name="IDS_CHROMEVOX_IGNORING_CASE">
         Ignoring case.
       </message>
       <message desc="Message spoken to user when switching to a mode where searching is case-sensitive." name="IDS_CHROMEVOX_CASE_SENSITIVE">
         Case sensitive.
       </message>
 
       <!-- Keyboard Explorer -->
       <message desc="Describes the back key in the ChromeVox keyboard explorer." name="IDS_CHROMEVOX_BACK_KEY">
         back
@@ skipping 71 matching lines @@
       </message>
       <message desc="Spoken when switching to the classic ChromeVox experience." name="IDS_CHROMEVOX_SWITCH_TO_CLASSIC">
         Switched to Classic ChromeVox
       </message>
       <message desc="Spoken when switching to the new beta experience." name="IDS_CHROMEVOX_SWITCH_TO_NEXT">
         Switched to ChromeVox Next
       </message>
     </messages>
   </release>
 </grit>