Clear DNS cache and passive log collected on incognito close.

chrome/browser/io_thread.cc

Index: chrome/browser/io_thread.cc
===================================================================
--- chrome/browser/io_thread.cc	(revision 112998)
+++ chrome/browser/io_thread.cc	(working copy)
@@ -395,6 +395,15 @@
   return net_log_;
 }
 
+void IOThread::ChangedToOnTheRecord() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  BrowserThread::PostTask(
+      BrowserThread::IO,
+      FROM_HERE,
+      base::Bind(&IOThread::ChangedToOnTheRecordOnIOThread,
+                 base::Unretained(this)));
+}
+
 net::URLRequestContextGetter* IOThread::system_url_request_context_getter() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (!system_url_request_context_getter_) {
@@ -593,6 +602,19 @@
   return ssl_config_service_manager_->Get();
 }
 
+void IOThread::ChangedToOnTheRecordOnIOThread() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  // Clear the host cache to avoid showing entries from the OTR session
+  // in about:net-internals.
+  ClearHostCache();
+
+  // Clear all of the passively logged data.
+  // TODO(eroman): this is a bit heavy handed, really all we need to do is
+  //               clear the data pertaining to incognito context.
+  net_log_->ClearAllPassivelyCapturedEvents();
+}
+
 void IOThread::InitSystemRequestContext() {
   if (system_url_request_context_getter_)
     return;