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

content/browser/system_message_window_win.cc

Index: content/browser/system_message_window_win.cc
diff --git a/content/browser/system_message_window_win.cc b/content/browser/system_message_window_win.cc
index 7f9a7992fb34434ce61134dece4bd9360d1d1f52..4a96dfb645d937713cf0b61ec275aeae54cf3ec5 100644
--- a/content/browser/system_message_window_win.cc
+++ b/content/browser/system_message_window_win.cc
@@ -12,7 +12,10 @@
 #include "base/system_monitor/system_monitor.h"
 #include "base/win/wrapped_window_proc.h"
 
+namespace content {
+
 namespace {
+
 const wchar_t kWindowClassName[] = L"Chrome_SystemMessageWindow";
 
 // A static map from a device category guid to base::SystemMonitor::DeviceType.
@@ -23,6 +26,7 @@ struct {
   { KSCATEGORY_AUDIO, base::SystemMonitor::DEVTYPE_AUDIO_CAPTURE },
   { KSCATEGORY_VIDEO, base::SystemMonitor::DEVTYPE_VIDEO_CAPTURE },
 };
+
 }  // namespace
 
 // Manages the device notification handles for SystemMessageWindowWin.
@@ -149,3 +153,5 @@ LRESULT CALLBACK SystemMessageWindowWin::WndProc(HWND hwnd, UINT message,
 
   return ::DefWindowProc(hwnd, message, wparam, lparam);
 }
+
+}  // namespace content