Move Extension into extensions namespace

chrome/browser/download/chrome_download_manager_delegate.cc

Index: chrome/browser/download/chrome_download_manager_delegate.cc
diff --git a/chrome/browser/download/chrome_download_manager_delegate.cc b/chrome/browser/download/chrome_download_manager_delegate.cc
index 00580825c7dde76ec4a05700fcf5d9f2dab2bd5d..aad682d4223cd4d2e37818650076bf29d110ef4b 100644
--- a/chrome/browser/download/chrome_download_manager_delegate.cc
+++ b/chrome/browser/download/chrome_download_manager_delegate.cc
@@ -114,7 +114,7 @@ bool ChromeDownloadManagerDelegate::IsExtensionDownload(
   if (item->PromptUserForSaveLocation())
     return false;
 
-  if (item->GetMimeType() == Extension::kMimeType ||
+  if (item->GetMimeType() == extensions::Extension::kMimeType ||
       UserScript::IsURLUserScript(item->GetURL(), item->GetMimeType())) {
     return true;
   } else {
@@ -212,7 +212,7 @@ bool ChromeDownloadManagerDelegate::ShouldOpenFileBasedOnExtension(
   FilePath::StringType extension = path.Extension();
   if (extension.empty())
     return false;
-  if (Extension::IsExtension(path))
+  if (extensions::Extension::IsExtension(path))
     return false;
   DCHECK(extension[0] == FilePath::kExtensionSeparator);
   extension.erase(0, 1);