Generalize content::URLDataSource so that it can be used by the network service.

chrome/browser/search/thumbnail_source.cc

Index: chrome/browser/search/thumbnail_source.cc
diff --git a/chrome/browser/search/thumbnail_source.cc b/chrome/browser/search/thumbnail_source.cc
index 7ef5939d05421dacf7c46a3930589b05ec4213d3..95bfd6a20304832514dab7b46a89b776bc0adfb6 100644
--- a/chrome/browser/search/thumbnail_source.cc
+++ b/chrome/browser/search/thumbnail_source.cc
@@ -84,10 +84,15 @@ bool ThumbnailSource::AllowCaching() const {
 }
 
 bool ThumbnailSource::ShouldServiceRequest(
-    const net::URLRequest* request) const {
-  if (request->url().SchemeIs(chrome::kChromeSearchScheme))
-    return InstantIOContext::ShouldServiceRequest(request);
-  return URLDataSource::ShouldServiceRequest(request);
+    const GURL& url,
+    content::ResourceContext* resource_context,
+    int render_process_id) const {
+  if (url.SchemeIs(chrome::kChromeSearchScheme)) {
+    return InstantIOContext::ShouldServiceRequest(url, resource_context,
+                                                  render_process_id);
+  }
+  return URLDataSource::ShouldServiceRequest(url, resource_context,
+                                             render_process_id);
 }
 
 void ThumbnailSource::ExtractPageAndThumbnailUrls(