Revert of Remove some legacy versions of StartsWith and EndsWith.

pdf/document_loader.cc

Index: pdf/document_loader.cc
diff --git a/pdf/document_loader.cc b/pdf/document_loader.cc
index 28a6ee4ebd74dfc643fd49759ddde124f7847d0b..f696656058eb889c7fe73240892f1f07d0c557a7 100644
--- a/pdf/document_loader.cc
+++ b/pdf/document_loader.cc
@@ -68,15 +68,12 @@
 }
 
 bool IsValidContentType(const std::string& type) {
-  return (base::EndsWith(type, "/pdf", base::CompareCase::INSENSITIVE_ASCII) ||
-          base::EndsWith(type, ".pdf", base::CompareCase::INSENSITIVE_ASCII) ||
-          base::EndsWith(type, "/x-pdf",
-                         base::CompareCase::INSENSITIVE_ASCII) ||
-          base::EndsWith(type, "/*", base::CompareCase::INSENSITIVE_ASCII) ||
-          base::EndsWith(type, "/acrobat",
-                         base::CompareCase::INSENSITIVE_ASCII) ||
-          base::EndsWith(type, "/unknown",
-                         base::CompareCase::INSENSITIVE_ASCII));
+  return (base::EndsWith(type, "/pdf", false) ||
+          base::EndsWith(type, ".pdf", false) ||
+          base::EndsWith(type, "/x-pdf", false) ||
+          base::EndsWith(type, "/*", false) ||
+          base::EndsWith(type, "/acrobat", false) ||
+          base::EndsWith(type, "/unknown", false));
 }
 
 }  // namespace