Move runner stuff into a runner namespace.

mojo/runner/in_process_native_runner_unittest.cc

Index: mojo/runner/in_process_native_runner_unittest.cc
diff --git a/mojo/runner/in_process_native_runner_unittest.cc b/mojo/runner/in_process_native_runner_unittest.cc
index 12fecfc9179e72bbc6cd1108d513b43c139f5822..f5e098f344317ef0872d5176e6fd3cfb656f35b7 100644
--- a/mojo/runner/in_process_native_runner_unittest.cc
+++ b/mojo/runner/in_process_native_runner_unittest.cc
@@ -8,7 +8,7 @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
-namespace shell {
+namespace runner {
 
 TEST(InProcessNativeRunnerTest, NotStarted) {
   Context context;
@@ -19,5 +19,5 @@ TEST(InProcessNativeRunnerTest, NotStarted) {
   // Shouldn't crash or DCHECK on destruction.
 }
 
-}  // namespace shell
+}  // namespace runner
 }  // namespace mojo