Eliminate build warnings in base/ for Android x64

base/debug/proc_maps_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/debug/proc_maps_linux.h"
 
 #include <fcntl.h>
 
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_ANDROID)
 #include <inttypes.h>
 #endif
 
 #include "base/file_util.h"
 #include "base/files/scoped_file.h"
 #include "base/strings/string_split.h"
 
-#if defined(OS_ANDROID)
-// Bionic's inttypes.h defines PRI/SCNxPTR as an unsigned long int, which
-// is incompatible with Bionic's stdint.h defining uintptr_t as a unsigned int:
+#if defined(OS_ANDROID) && !defined(__LP64__)
+// In 32-bit mode, Bionic's inttypes.h defines PRI/SCNxPTR as an
+// unsigned long int, which is incompatible with Bionic's stdint.h
+// defining uintptr_t as an unsigned int:
 // https://code.google.com/p/android/issues/detail?id=57218
 #undef SCNxPTR
 #define SCNxPTR "x"
 #endif
 
 namespace base {
 namespace debug {
 
 // Scans |proc_maps| starting from |pos| returning true if the gate VMA was
 // found, otherwise returns false.
@@ skipping 123 matching lines @@
     regions.push_back(region);
     regions.back().path.assign(line + path_index);
   }
 
   regions_out->swap(regions);
   return true;
 }
 
 }  // namespace debug
 }  // namespace base