[lldb][NFC] Delete unused function Breakpoint::GetEventIdentifier

This is unused

Differential Revision: https://reviews.llvm.org/D147746

Author: bulbazord

lldb/include/lldb/Breakpoint/Breakpoint.h

@@ -80,7 +80,6 @@ namespace lldb_private {
 class Breakpoint : public std::enable_shared_from_this<Breakpoint>,
                    public Stoppoint {
 public:
-  static ConstString GetEventIdentifier();
   static const char *
       BreakpointEventTypeAsCString(lldb::BreakpointEventType type);
 

lldb/source/Breakpoint/Breakpoint.cpp

@@ -37,11 +37,6 @@ using namespace lldb;
 using namespace lldb_private;
 using namespace llvm;
 
-ConstString Breakpoint::GetEventIdentifier() {
-  static ConstString g_identifier("event-identifier.breakpoint.changed");
-  return g_identifier;
-}
-
 const char *Breakpoint::g_option_names[static_cast<uint32_t>(
     Breakpoint::OptionNames::LastOptionName)]{"Names", "Hardware"};