Generate all extension schema namespaces as "api" and instead vary the generated bundle names.

extensions/browser/api/cast_channel/logger.cc

Index: extensions/browser/api/cast_channel/logger.cc
diff --git a/extensions/browser/api/cast_channel/logger.cc b/extensions/browser/api/cast_channel/logger.cc
index 38d8e6180991b2abae55de812b0b6ccc67345c5b..e786a3b52bef4e2da9587bc4096a48e45a342ff0 100644
--- a/extensions/browser/api/cast_channel/logger.cc
+++ b/extensions/browser/api/cast_channel/logger.cc
@@ -15,7 +15,7 @@
 #include "third_party/zlib/zlib.h"
 
 namespace extensions {
-namespace core_api {
+namespace api {
 namespace cast_channel {
 
 using net::IPEndPoint;
@@ -368,5 +368,5 @@ LastErrors Logger::GetLastErrors(int channel_id) const {
 }
 
 }  // namespace cast_channel
-}  // namespace core_api
+}  // namespace api
 }  // namespace extensions