Base64-decode encoded ppds from the quirksserver, and update tests.

chromeos/printing/ppd_provider.cc

Index: chromeos/printing/ppd_provider.cc
diff --git a/chromeos/printing/ppd_provider.cc b/chromeos/printing/ppd_provider.cc
index 1d85f0a339ec6a2c633331cb3bf0af3b637bf379..f05b53f0d294e5f0747e6f39e9dabd24fb6f1b35 100644
--- a/chromeos/printing/ppd_provider.cc
+++ b/chromeos/printing/ppd_provider.cc
@@ -7,6 +7,7 @@
 #include <unordered_map>
 #include <utility>
 
+#include "base/base64.h"
 #include "base/bind_helpers.h"
 #include "base/files/file_util.h"
 #include "base/json/json_parser.h"
@@ -308,7 +309,7 @@ class PpdProviderImpl : public PpdProvider {
       ppd_contents->clear();
       return false;
     }
-    return true;
+    return base::Base64Decode(*ppd_contents, ppd_contents);
   }
 
   // Return the ResolveFetchData associated with |source|.