Teach the network service to clear its disk cache if requested.

mojo/services/network/network_context.h

Index: mojo/services/network/network_context.h
diff --git a/mojo/services/network/network_context.h b/mojo/services/network/network_context.h
index 96e8d684457efeee1fd1f181f9515477bb0639b9..94f2d2c04d068c7bbe44dbc4ad0c861800fe27f2 100644
--- a/mojo/services/network/network_context.h
+++ b/mojo/services/network/network_context.h
@@ -7,8 +7,11 @@
 
 #include <set>
 
+#include "base/callback.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/task_runner.h"
 
 namespace base {
 class FilePath;
@@ -24,6 +27,13 @@ class URLLoaderImpl;
 
 class NetworkContext {
  public:
+  // Cleares the cached content. The actual deletion will be performed using the
+  // given task runner, but cache appears as cleared immediately after the
+  // function returns.
+  static void ClearCache(const base::FilePath& base_path,
+                         scoped_refptr<base::TaskRunner> task_runner,
+                         const base::Closure& clear_finished_callback);
+
   explicit NetworkContext(
       scoped_ptr<net::URLRequestContext> url_request_context);
   explicit NetworkContext(const base::FilePath& base_path);