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

extensions/browser/api/cast_channel/logger_unittest.cc

Index: extensions/browser/api/cast_channel/logger_unittest.cc
diff --git a/extensions/browser/api/cast_channel/logger_unittest.cc b/extensions/browser/api/cast_channel/logger_unittest.cc
index 617dcf8a93f3838fc464561e46ca413879030f6b..c92c00f57ff981e244945995e506ece775480c9a 100644
--- a/extensions/browser/api/cast_channel/logger_unittest.cc
+++ b/extensions/browser/api/cast_channel/logger_unittest.cc
@@ -13,7 +13,7 @@
 #include "third_party/zlib/zlib.h"
 
 namespace extensions {
-namespace core_api {
+namespace api {
 namespace cast_channel {
 
 const int kTestNssErrorCode = -8164;
@@ -331,5 +331,5 @@ TEST_F(CastChannelLoggerTest, Reset) {
 }
 
 }  // namespace cast_channel
-}  // namespace core_api
+}  // namespace api
 }  // namespace extensions