Change DumpProcessWithoutCrash to use load-time dynamic linking

base/debug/dump_without_crashing.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/debug/dump_without_crashing.h"
 
 #include "base/logging.h"
 
 namespace {
 
 // Pointer to the function that's called by DumpWithoutCrashing() to dump the
 // process's memory.
 void (CDECL *dump_without_crashing_function_)() = NULL;
 
 }  // namespace
 
 namespace base {
 
 namespace debug {
 
 bool DumpWithoutCrashing() {
   if (dump_without_crashing_function_) {
     (*dump_without_crashing_function_)();
     return true;
   }
   return false;
 }
 
 void SetDumpWithoutCrashingFunction(void (CDECL *function)()) {
+#if !defined(COMPONENT_BUILD)
+  // In component builds, the same base is shared between modules
+  // so might be initialized several times. However in non-
+  // component builds this should never happen.
+  DCHECK(!dump_without_crashing_function_);
+#endif
   dump_without_crashing_function_ = function;
 }
 
 }  // namespace debug
 
 }  // namespace base