Eliminate build warnings in base/ for Android x64

base/os_compat_android.cc

 // Copyright (c) 2012 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/os_compat_android.h"
 
 #include <asm/unistd.h>
 #include <errno.h>
 #include <math.h>
 #include <sys/stat.h>
@@ skipping 23 matching lines @@
   ts[0].tv_nsec = tv[0].tv_usec * 1000;
   ts[1].tv_sec = tv[1].tv_sec;
   ts[1].tv_nsec = tv[1].tv_usec * 1000;
   return syscall(__NR_utimensat, fd, NULL, ts, 0);
 }
 
 // Android has only timegm64() and no timegm().
 // We replicate the behaviour of timegm() when the result overflows time_t.
 time_t timegm(struct tm* const t) {
   // time_t is signed on Android.
-  static const time_t kTimeMax = ~(1 << (sizeof(time_t) * CHAR_BIT - 1));
-  static const time_t kTimeMin = (1 << (sizeof(time_t) * CHAR_BIT - 1));
+  static const time_t kTimeMax = ~(1L << (sizeof(time_t) * CHAR_BIT - 1));
+  static const time_t kTimeMin = (1L << (sizeof(time_t) * CHAR_BIT - 1));
   time64_t result = timegm64(t);
   if (result < kTimeMin || result > kTimeMax)
     return -1;
   return result;
 }
 
 // The following is only needed when building with GCC 4.6 or higher
 // (i.e. not with Android GCC 4.4.3, nor with Clang).
 //
 // GCC is now capable of optimizing successive calls to sin() and cos() into
@@ skipping 106 matching lines @@
       // The directory doesn't exist, but an error occured
       return NULL;
     }
   }
 
   // We reached the max number of tries.
   return NULL;
 }
 
 }  // extern "C"