Fixes for -Wunused-function on Linux, Android and ChromeOS

base/process/memory_linux.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 "base/process/memory.h"
 
 #include <new>
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/process/internal_linux.h"
 #include "base/strings/string_number_conversions.h"
 
 namespace base {
 
 size_t g_oom_size = 0U;
 
 namespace {
 
+#if !defined(OS_ANDROID)
 void OnNoMemorySize(size_t size) {
   g_oom_size = size;
 
   if (size != 0)
     LOG(FATAL) << "Out of memory, size = " << size;
   LOG(FATAL) << "Out of memory.";
 }
 
 void OnNoMemory() {
   OnNoMemorySize(0);
 }
+#endif  // !defined(OS_ANDROID)
 
 }  // namespace
 
 #if !defined(ADDRESS_SANITIZER) && !defined(MEMORY_SANITIZER) && \
     !defined(THREAD_SANITIZER) && !defined(LEAK_SANITIZER)
 
 #if defined(LIBC_GLIBC) && !defined(USE_TCMALLOC)
 
 extern "C" {
 void* __libc_malloc(size_t size);
@@ skipping 132 matching lines @@
     int score_len = static_cast<int>(score_str.length());
     return (score_len == file_util::WriteFile(oom_file,
                                               score_str.c_str(),
                                               score_len));
   }
 
   return false;
 }
 
 }  // namespace base