Mutex: Remove the deprecated absl::RegisterSymbolizer() hook

absl::RegisterSymbolizer() has been deprecated for 5 years.
It is being removed following our compatibility policy.
<https://abseil.io/about/compatibility>
PiperOrigin-RevId: 532174866
Change-Id: Id5c3b86698e389099d3d707c4e57f30f1f155d2e

absl/synchronization/mutex.cc

@@ -103,9 +103,6 @@ ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES absl::base_internal::AtomicHook<void (*)(
 ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
 ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
     absl::base_internal::AtomicHook<void (*)(const char *msg, const void *cv)>
     absl::base_internal::AtomicHook<void (*)(const char *msg, const void *cv)>
         cond_var_tracer;
         cond_var_tracer;
-ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES absl::base_internal::AtomicHook<
-    bool (*)(const void *pc, char *out, int out_size)>
-    symbolizer(absl::Symbolize);
 
 
 }  // namespace
 }  // namespace
 
 
@@ -126,10 +123,6 @@ void RegisterCondVarTracer(void (*fn)(const char *msg, const void *cv)) {
   cond_var_tracer.Store(fn);
   cond_var_tracer.Store(fn);
 }
 }
 
 
-void RegisterSymbolizer(bool (*fn)(const void *pc, char *out, int out_size)) {
-  symbolizer.Store(fn);
-}
-
 namespace {
 namespace {
 // Represents the strategy for spin and yield.
 // Represents the strategy for spin and yield.
 // See the comment in GetMutexGlobals() for more information.
 // See the comment in GetMutexGlobals() for more information.
@@ -1289,7 +1282,7 @@ static inline void DebugOnlyLockLeave(Mutex *mu) {
 
 
 static char *StackString(void **pcs, int n, char *buf, int maxlen,
 static char *StackString(void **pcs, int n, char *buf, int maxlen,
                          bool symbolize) {
                          bool symbolize) {
-  static const int kSymLen = 200;
+  static constexpr int kSymLen = 200;
   char sym[kSymLen];
   char sym[kSymLen];
   int len = 0;
   int len = 0;
   for (int i = 0; i != n; i++) {
   for (int i = 0; i != n; i++) {
@@ -1297,7 +1290,7 @@ static char *StackString(void **pcs, int n, char *buf, int maxlen,
       return buf;
       return buf;
     size_t count = static_cast<size_t>(maxlen - len);
     size_t count = static_cast<size_t>(maxlen - len);
     if (symbolize) {
     if (symbolize) {
-      if (!symbolizer(pcs[i], sym, kSymLen)) {
+      if (!absl::Symbolize(pcs[i], sym, kSymLen)) {
         sym[0] = '\0';
         sym[0] = '\0';
       }
       }
       snprintf(buf + len, count, "%s\t@ %p %s\n", (i == 0 ? "\n" : ""), pcs[i],
       snprintf(buf + len, count, "%s\t@ %p %s\n", (i == 0 ? "\n" : ""), pcs[i],

absl/synchronization/mutex.h

@@ -1105,23 +1105,6 @@ void RegisterMutexTracer(void (*fn)(const char *msg, const void *obj,
 // RegisterMutexProfiler() above.
 // RegisterMutexProfiler() above.
 void RegisterCondVarTracer(void (*fn)(const char *msg, const void *cv));
 void RegisterCondVarTracer(void (*fn)(const char *msg, const void *cv));
 
 
-// Register a hook for symbolizing stack traces in deadlock detector reports.
-//
-// 'pc' is the program counter being symbolized, 'out' is the buffer to write
-// into, and 'out_size' is the size of the buffer.  This function can return
-// false if symbolizing failed, or true if a NUL-terminated symbol was written
-// to 'out.'
-//
-// This has the same ordering and single-use limitations as
-// RegisterMutexProfiler() above.
-//
-// DEPRECATED: The default symbolizer function is absl::Symbolize() and the
-// ability to register a different hook for symbolizing stack traces will be
-// removed on or after 2023-05-01.
-ABSL_DEPRECATED("absl::RegisterSymbolizer() is deprecated and will be removed "
-                "on or after 2023-05-01")
-void RegisterSymbolizer(bool (*fn)(const void *pc, char *out, int out_size));
-
 // EnableMutexInvariantDebugging()
 // EnableMutexInvariantDebugging()
 //
 //
 // Enable or disable global support for Mutex invariant debugging.  If enabled,
 // Enable or disable global support for Mutex invariant debugging.  If enabled,