PDF: Use chrome.resourcesPrivate instead of Pepper to display translated strings

chrome/browser/extensions/api/resources_private/resources_private_api.cc

Index: chrome/browser/extensions/api/resources_private/resources_private_api.cc
diff --git a/chrome/browser/extensions/api/resources_private/resources_private_api.cc b/chrome/browser/extensions/api/resources_private/resources_private_api.cc
index a4b720e8ad4808b0c0dfb39cfc9c56e94b494611..bfaa40f7f400f3c49a414b282cb953404dc6713b 100644
--- a/chrome/browser/extensions/api/resources_private/resources_private_api.cc
+++ b/chrome/browser/extensions/api/resources_private/resources_private_api.cc
@@ -10,6 +10,7 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/common/extensions/api/resources_private.h"
 #include "chrome/grit/generated_resources.h"
+#include "components/strings/grit/components_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/webui/web_ui_util.h"
 
@@ -28,6 +29,15 @@ void AddStringsForIdentity(base::DictionaryValue* dict) {
                   l10n_util::GetStringUTF16(IDS_EXTENSION_CONFIRM_PERMISSIONS));
 }
 
+void AddStringsForPdf(base::DictionaryValue* dict) {
+  dict->SetString("passwordPrompt",
+                  l10n_util::GetStringUTF16(IDS_PDF_NEED_PASSWORD));
+  dict->SetString("pageLoading",
+                  l10n_util::GetStringUTF16(IDS_PDF_PAGE_LOADING));
+  dict->SetString("pageLoadFailed",
+                  l10n_util::GetStringUTF16(IDS_PDF_PAGE_LOAD_FAILED));
+}
+
 }  // namespace
 
 namespace get_strings = api::resources_private::GetStrings;
@@ -46,6 +56,9 @@ ExtensionFunction::ResponseAction ResourcesPrivateGetStringsFunction::Run() {
     case api::resources_private::COMPONENT_IDENTITY:
       AddStringsForIdentity(dict.get());
       break;
+    case api::resources_private::COMPONENT_PDF:
+      AddStringsForPdf(dict.get());
+      break;
     case api::resources_private::COMPONENT_NONE:
       NOTREACHED();
   }