Add the ability to specify a default MIME type when loading a resource. We'l...

chrome/browser/renderer_host/resource_dispatcher_host.h

Index: chrome/browser/renderer_host/resource_dispatcher_host.h
===================================================================
--- chrome/browser/renderer_host/resource_dispatcher_host.h	(revision 12710)
+++ chrome/browser/renderer_host/resource_dispatcher_host.h	(working copy)
@@ -79,6 +79,7 @@
                      int request_id,
                      std::string frame_origin,
                      std::string main_frame_origin,
+                     std::string default_mime_type,
                      ResourceType::Type resource_type,
                      uint64 upload_size)
         : resource_handler(handler),
@@ -93,6 +94,7 @@
           pause_count(0),
           frame_origin(frame_origin),
           main_frame_origin(main_frame_origin),
+          default_mime_type(default_mime_type),
           resource_type(resource_type),
           filter_policy(FilterPolicy::DONT_FILTER),
           last_load_state(net::LOAD_STATE_IDLE),
@@ -141,6 +143,10 @@
     // this request.
     std::string main_frame_origin;
 
+    // The MIME type to use if this request lacks a Content-Type header.  If

[wtc, 2009/03/28 00:45:35]

Nit: "response header", to avoid confusion with a Content-Type
request header for a POST request.  Alternatively we can say
"the response to this request lacks a Content-Type header".

+    // |default_mime_type| is "", then use the default sniffing algorith.

[wtc, 2009/03/28 00:45:35]

Typo: algorith

+    std::string default_mime_type;
+
     ResourceType::Type resource_type;
 
     // Whether the content for this request should be filtered (on the renderer