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

content/browser/mach_broker_mac_unittest.cc

Index: content/browser/mach_broker_mac_unittest.cc
diff --git a/content/browser/mach_broker_mac_unittest.cc b/content/browser/mach_broker_mac_unittest.cc
index 9572dca368d851950965ca3d58b880968de6312e..7bd88a550cffad1d28f3b5c86bd59d2a864e73fe 100644
--- a/content/browser/mach_broker_mac_unittest.cc
+++ b/content/browser/mach_broker_mac_unittest.cc
@@ -7,6 +7,8 @@
 #include "base/synchronization/lock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+namespace content {
+
 class MachBrokerTest : public testing::Test {
  public:
   // Helper function to acquire/release locks and call |PlaceholderForPid()|.
@@ -58,3 +60,5 @@ TEST_F(MachBrokerTest, FinalizeUnknownPid) {
   FinalizePid(1u, MachBroker::MachInfo().SetTask(100u));
   EXPECT_EQ(0u, broker_.TaskForPid(1u));
 }
+
+}  // namespace content