Remove implicit conversions from scoped_refptr to T* in extensions code.

chrome/browser/chromeos/extensions/external_cache.cc

Index: chrome/browser/chromeos/extensions/external_cache.cc
diff --git a/chrome/browser/chromeos/extensions/external_cache.cc b/chrome/browser/chromeos/extensions/external_cache.cc
index 4ec9fb5c336cd7adafa3e8e7a6ee597914eaa6bf..9bd9a69812adff302d4eab236989277332109272 100644
--- a/chrome/browser/chromeos/extensions/external_cache.cc
+++ b/chrome/browser/chromeos/extensions/external_cache.cc
@@ -222,9 +222,9 @@ void ExternalCache::CheckCache() {
     return;
 
   // If request_context_ is missing we can't download anything.
-  if (!downloader_ && request_context_) {
+  if (!downloader_ && request_context_.get()) {
     downloader_.reset(
-        new extensions::ExtensionDownloader(this, request_context_));
+        new extensions::ExtensionDownloader(this, request_context_.get()));
   }
 
   cached_extensions_->Clear();