Move Time, TimeDelta and TimeTicks into namespace base.

Review URL: http://codereview.chromium.org/7995

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@4022 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/net/url_request/url_request_unittest.cc b/net/url_request/url_request_unittest.cc
index 9bf467fa9..cd21a2d 100644
--- a/net/url_request/url_request_unittest.cc
+++ b/net/url_request/url_request_unittest.cc
@@ -26,6 +26,8 @@
 #include "net/url_request/url_request.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using base::Time;
+
 namespace {
 
 class URLRequestTest : public testing::Test {