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

chrome/browser/ui/webui/fallback_icon_source.cc

Index: chrome/browser/ui/webui/fallback_icon_source.cc
diff --git a/chrome/browser/ui/webui/fallback_icon_source.cc b/chrome/browser/ui/webui/fallback_icon_source.cc
index a8781d2b7c656b333821bbb89d9a1b3448b727ab..c282ed0884f9fb57638e10f527bfddcc84f26ecd 100644
--- a/chrome/browser/ui/webui/fallback_icon_source.cc
+++ b/chrome/browser/ui/webui/fallback_icon_source.cc
@@ -55,6 +55,10 @@ std::string FallbackIconSource::GetMimeType(const std::string&) const {
   return "image/png";
 }
 
+bool FallbackIconSource::AllowCaching() const {
+  return false;
+}
+
 bool FallbackIconSource::ShouldReplaceExistingSource() const {
   // Leave the existing DataSource in place, otherwise we'll drop any pending
   // requests on the floor.