Faster Reload: Specify AllowCaching = false for some URLDataSources that need it

chrome/browser/search/iframe_source.cc

Index: chrome/browser/search/iframe_source.cc
diff --git a/chrome/browser/search/iframe_source.cc b/chrome/browser/search/iframe_source.cc
index 925c97ed2c84107cfccc2c2ce7f9cf48c03f2730..cae15fe43a0e36a3da2b8ee0bfb305a18d7a711a 100644
--- a/chrome/browser/search/iframe_source.cc
+++ b/chrome/browser/search/iframe_source.cc
@@ -36,6 +36,10 @@ std::string IframeSource::GetMimeType(
   return std::string();
 }
 
+bool IframeSource::AllowCaching() const {
+  return false;
+}
+
 bool IframeSource::ShouldServiceRequest(
     const net::URLRequest* request) const {
   const std::string& path = request->url().path();