Change DumpProcessWithoutCrash to use load-time dynamic linking

base/debug/dump_without_crashing.h

 // 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.
 
 #ifndef BASE_DEBUG_DUMP_WITHOUT_CRASHING_H_
 #define BASE_DEBUG_DUMP_WITHOUT_CRASHING_H_
 
 #include "base/base_export.h"
 #include "base/compiler_specific.h"
 #include "build/build_config.h"
 
 namespace base {
 
 namespace debug {
 
 // Handler to silently dump the current process without crashing.
 // Before calling this function, call SetDumpWithoutCrashingFunction to pass a
-// function pointer, typically chrome!DumpProcessWithoutCrash.  See example code
-// in chrome_main.cc that does this for chrome.dll.
+// function pointer.
+// Windows:
+// This must be done for each instance of base (i.e. module) and is normally
+// chrome_elf!DumpProcessWithoutCrash. See example code in chrome_main.cc that
+// does this for chrome.dll and chrome_child.dll. Note: Crashpad sets this up
+// for main chrome.exe as part of calling crash_reporter::InitializeCrashpad.
+// Mac/Linux:
+// Crashpad does this as part of crash_reporter::InitializeCrashpad.
 // Returns false if called before SetDumpWithoutCrashingFunction.
 BASE_EXPORT bool DumpWithoutCrashing();
 
 // Sets a function that'll be invoked to dump the current process when
 // DumpWithoutCrashing() is called.
 BASE_EXPORT void SetDumpWithoutCrashingFunction(void (CDECL *function)());
 
 }  // namespace debug
 
 }  // namespace base
 
 #endif  // BASE_DEBUG_DUMP_WITHOUT_CRASHING_H_