Move remaining content test code into the content namespace.

content/test/layout_test_http_server.cc

Index: content/test/layout_test_http_server.cc
===================================================================
--- content/test/layout_test_http_server.cc	(revision 164732)
+++ content/test/layout_test_http_server.cc	(working copy)
@@ -16,6 +16,7 @@
 #include "base/win/windows_version.h"
 #endif
 
+namespace content {
 namespace {
 
 bool PrepareCommandLine(CommandLine* cmd_line) {
@@ -67,7 +68,7 @@
   cmd_line.AppendArg("--port=" + base::IntToString(port_));
 
   FilePath layout_tests_dir;
-  if (!PathService::Get(content::DIR_LAYOUT_TESTS, &layout_tests_dir))
+  if (!PathService::Get(DIR_LAYOUT_TESTS, &layout_tests_dir))
     return false;
   cmd_line.AppendArgNative(FILE_PATH_LITERAL("--layout_tests_dir=") +
                            layout_tests_dir.value());
@@ -130,3 +131,5 @@
 
   return stopped;
 }
+
+}  // namespace content