Pepper: Simplify manifest download logic.

components/nacl/renderer/manifest_downloader.h

Index: components/nacl/renderer/manifest_downloader.h
diff --git a/components/nacl/renderer/manifest_downloader.h b/components/nacl/renderer/manifest_downloader.h
index dbdbf8453c6d1a3b200a9fa1bdbc84e9f62a9e4e..7488cab0c2dfb0e40df5092deb4bafd586784ae0 100644
--- a/components/nacl/renderer/manifest_downloader.h
+++ b/components/nacl/renderer/manifest_downloader.h
@@ -26,6 +26,12 @@ class ManifestDownloader : public blink::WebURLLoaderClient {
   ManifestDownloader(bool is_installed, ManifestDownloaderCallback cb);
   virtual ~ManifestDownloader();
 
+  // This is a pretty arbitrary limit on the byte size of the NaCl manifest
+  // file.
+  // Note that the resulting string object has to have at least one byte extra
+  // for the null termination character.
+  static const size_t kNaClManifestMaxFileBytes = 1024 * 1024;
+
  private:
   // WebURLLoaderClient implementation.
   virtual void didReceiveResponse(blink::WebURLLoader* loader,