Move ExtensionEventRouter and related into extensions namespace

chrome/browser/extensions/event_names.h

Index: chrome/browser/extensions/event_names.h
diff --git a/chrome/browser/extensions/extension_event_names.h b/chrome/browser/extensions/event_names.h
similarity index 88%
rename from chrome/browser/extensions/extension_event_names.h
rename to chrome/browser/extensions/event_names.h
index de3b6b87f8c31ff36670aced0a99fa6251d4c8cc..bcbf1534188073343e3367af411152657712c514 100644
--- a/chrome/browser/extensions/extension_event_names.h
+++ b/chrome/browser/extensions/event_names.h
@@ -4,10 +4,12 @@
 
 // Constants for the event names sent to extensions.
 
-#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_EVENT_NAMES_H_
-#define CHROME_BROWSER_EXTENSIONS_EXTENSION_EVENT_NAMES_H_
+#ifndef CHROME_BROWSER_EXTENSIONS_EVENT_NAMES_H_
+#define CHROME_BROWSER_EXTENSIONS_EVENT_NAMES_H_
 
-namespace extension_event_names {
+namespace extensions {
+
+namespace event_names {
 
 // Tabs.
 extern const char kOnTabActivated[];
@@ -70,6 +72,8 @@ extern const char kBluetoothOnDeviceDiscovered[];
 extern const char kBluetoothOnPowerChanged[];
 #endif
 
-};  // namespace extension_event_names
+}  // namespace event_names
+
+}  // namespace extensions
 
-#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_EVENT_NAMES_H_
+#endif  // CHROME_BROWSER_EXTENSIONS_EVENT_NAMES_H_