Allow extensions of the ManifestParser outside of the content/ layer.

content/renderer/manifest/manifest_manager.cc

Index: content/renderer/manifest/manifest_manager.cc
diff --git a/content/renderer/manifest/manifest_manager.cc b/content/renderer/manifest/manifest_manager.cc
index 98e976e2c2c1117d44f8f494bc74dd97338f89cf..b87524941c626b5e69280834a46c2fb0275f000d 100644
--- a/content/renderer/manifest/manifest_manager.cc
+++ b/content/renderer/manifest/manifest_manager.cc
@@ -8,10 +8,10 @@
 #include "base/strings/nullable_string16.h"
 #include "content/common/manifest_manager_messages.h"
 #include "content/public/renderer/document_state.h"
+#include "content/public/renderer/manifest_parser.h"
 #include "content/public/renderer/navigation_state.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/renderer/fetchers/manifest_fetcher.h"
-#include "content/renderer/manifest/manifest_parser.h"
 #include "content/renderer/manifest/manifest_uma_util.h"
 #include "third_party/WebKit/public/platform/WebURLResponse.h"
 #include "third_party/WebKit/public/web/WebConsoleMessage.h"
@@ -141,12 +141,12 @@ void ManifestManager::OnManifestFetchComplete(
 
   ManifestUmaUtil::FetchSucceeded();
 
-  ManifestParser parser(data, response.url(), document_url);
-  parser.Parse();
+  scoped_ptr<ManifestParser> parser = ManifestParser::Get();
+  parser->Parse(data, response.url(), document_url);
 
   fetcher_.reset();
 
-  for (const std::string& msg : parser.errors()) {
+  for (const std::string& msg : parser->errors()) {
     blink::WebConsoleMessage message;
     message.level = blink::WebConsoleMessage::LevelError;
     message.text = blink::WebString::fromUTF8(msg);
@@ -155,12 +155,12 @@ void ManifestManager::OnManifestFetchComplete(
 
   // Having errors while parsing the manifest doesn't mean the manifest parsing
   // failed. Some properties might have been ignored but some others kept.
-  if (parser.failed()) {
+  if (parser->failed()) {
     ResolveCallbacks(ResolveStateFailure);
     return;
   }
 
-  manifest_ = parser.manifest();
+  manifest_ = parser->manifest();
   ResolveCallbacks(ResolveStateSuccess);
 }