Remove USE_LINUX_BREAKPAD ifdef since we don't need it for chromium anymore.

chrome/common/dump_without_crashing.cc

 // Copyright (c) 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 "build/build_config.h"
 
 #include "chrome/common/dump_without_crashing.h"
 
 #include "base/logging.h"
 #include "chrome/common/chrome_constants.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 namespace {
 
-#if defined(USE_LINUX_BREAKPAD) || defined(OS_MACOSX)
+#if defined(OS_POSIX)
 // Pointer to the function that's called by DumpWithoutCrashing() to dump the
 // process's memory.
 void (*dump_without_crashing_function_)() = NULL;
 #endif
 
 }  // namespace
 
 namespace logging {
 
 void DumpWithoutCrashing() {
 #if defined(OS_WIN)
   // Get the breakpad pointer from chrome.exe
   typedef void (__cdecl *DumpProcessFunction)();
   DumpProcessFunction DumpProcess = reinterpret_cast<DumpProcessFunction>(
       ::GetProcAddress(::GetModuleHandle(chrome::kBrowserProcessExecutableName),
                        "DumpProcess"));
   if (DumpProcess)
     DumpProcess();
-#elif defined(USE_LINUX_BREAKPAD) || defined(OS_MACOSX)
+#elif defined(OS_POSIX)
   if (dump_without_crashing_function_)
     (*dump_without_crashing_function_)();
 #else
   NOTIMPLEMENTED();
 #endif
 }
 
-#if defined(USE_LINUX_BREAKPAD) || defined(OS_MACOSX)
+#if defined(OS_POSIX)
 void SetDumpWithoutCrashingFunction(void (*function)()) {
   dump_without_crashing_function_ = function;
 }
 #endif
 
 }  // namespace logging