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

extensions/browser/api/cast_channel/cast_socket.cc

Index: extensions/browser/api/cast_channel/cast_socket.cc
diff --git a/extensions/browser/api/cast_channel/cast_socket.cc b/extensions/browser/api/cast_channel/cast_socket.cc
index 4c08f15ff9e9af11afa4e1c4ec914812d44766e1..76b4ebe114feb6cbe561824b473a594b8c64c62f 100644
--- a/extensions/browser/api/cast_channel/cast_socket.cc
+++ b/extensions/browser/api/cast_channel/cast_socket.cc
@@ -60,18 +60,18 @@ std::string FormatTimeForLogging(base::Time time) {
 
 namespace extensions {
 static base::LazyInstance<BrowserContextKeyedAPIFactory<
-    ApiResourceManager<core_api::cast_channel::CastSocket> > > g_factory =
+    ApiResourceManager<api::cast_channel::CastSocket>>> g_factory =
     LAZY_INSTANCE_INITIALIZER;
 
 // static
 template <>
 BrowserContextKeyedAPIFactory<
-    ApiResourceManager<core_api::cast_channel::CastSocket> >*
-ApiResourceManager<core_api::cast_channel::CastSocket>::GetFactoryInstance() {
+    ApiResourceManager<api::cast_channel::CastSocket>>*
+ApiResourceManager<api::cast_channel::CastSocket>::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
-namespace core_api {
+namespace api {
 namespace cast_channel {
 CastSocket::CastSocket(const std::string& owner_extension_id)
     : ApiResource(owner_extension_id) {
@@ -597,6 +597,6 @@ void CastSocketImpl::SetErrorState(ChannelError error_state) {
   delegate_->OnError(error_state_);
 }
 }  // namespace cast_channel
-}  // namespace core_api
+}  // namespace api
 }  // namespace extensions
 #undef VLOG_WITH_CONNECTION