Extend the TestRunner so that the manifest-src CSP directive can be tested from layout tests.

content/renderer/fetchers/manifest_fetcher.h

Index: content/renderer/fetchers/manifest_fetcher.h
diff --git a/content/renderer/fetchers/manifest_fetcher.h b/content/renderer/fetchers/manifest_fetcher.h
index a3afaa3e5a893da680ef8dd4b9179622e0e9af25..daa8f0a7bac0ed6658743d760cb5002c42bc6690 100644
--- a/content/renderer/fetchers/manifest_fetcher.h
+++ b/content/renderer/fetchers/manifest_fetcher.h
@@ -10,6 +10,7 @@
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
+#include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebURLResponse.h"
 
 class GURL;
@@ -25,7 +26,7 @@ class ResourceFetcher;
 // Helper class to download a Web Manifest. When an instance is created, the
 // caller need to call Start() and wait for the passed callback to be executed.
 // If the fetch fails, the callback will be called with two empty objects.
-class ManifestFetcher {
+class CONTENT_EXPORT ManifestFetcher {
  public:
   // This will be called asynchronously after the URL has been fetched,
   // successfully or not.  If there is a failure, response and data will both be