Remove legacy PDF JSON interface.

pdf/pdfium/pdfium_page.h

Index: pdf/pdfium/pdfium_page.h
diff --git a/pdf/pdfium/pdfium_page.h b/pdf/pdfium/pdfium_page.h
index 44cb5a902f42aafc606e14d70e8f59ccb2882811..fa94ed96a081339f0900921f1e6dd97b9df8add8 100644
--- a/pdf/pdfium/pdfium_page.h
+++ b/pdf/pdfium/pdfium_page.h
@@ -14,10 +14,6 @@
 #include "third_party/pdfium/public/fpdf_formfill.h"
 #include "third_party/pdfium/public/fpdf_text.h"
 
-namespace base {
-class Value;
-}
-
 namespace chrome_pdf {
 
 class PDFiumEngine;
@@ -43,9 +39,6 @@ class PDFiumPage {
   // Returns FPDF_TEXTPAGE for the page, loading and parsing it if necessary.
   FPDF_TEXTPAGE GetTextPage();
 
-  // Returns a DictionaryValue version of the page.
-  base::Value* GetAccessibleContentAsValue(int rotation);
-
   // Given a start char index, find the longest continuous run of text that's
   // in a single direction and with the same style and font size. Return the
   // length of that sequence and its font size and bounding box.