content/browser: Move more files into the content namespace.

content/browser/resolve_proxy_msg_helper_unittest.cc

Index: content/browser/resolve_proxy_msg_helper_unittest.cc
diff --git a/content/browser/resolve_proxy_msg_helper_unittest.cc b/content/browser/resolve_proxy_msg_helper_unittest.cc
index 7e8470aab8970a21c174b5d759ae4f96e4287e10..512e611f7f3612db0f261bca1e28c3452ce31a5e 100644
--- a/content/browser/resolve_proxy_msg_helper_unittest.cc
+++ b/content/browser/resolve_proxy_msg_helper_unittest.cc
@@ -13,8 +13,7 @@
 #include "net/proxy/proxy_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using content::BrowserThread;
-using content::BrowserThreadImpl;
+namespace content {
 
 // This ProxyConfigService always returns "http://pac" as the PAC url to use.
 class MockProxyConfigService : public net::ProxyConfigService {
@@ -235,3 +234,5 @@ TEST_F(ResolveProxyMsgHelperTest, CancelPendingRequests) {
   // It should also be the case that msg1, msg2, msg3 were deleted by the
   // cancellation. (Else will show up as a leak in Valgrind).
 }
+
+}  // namespace content