Linux: Relax the deprecation glibc version check slightly.

chrome/browser/obsolete_system/obsolete_system_linux.cc

 // Copyright 2015 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 "chrome/browser/obsolete_system/obsolete_system.h"
 
 #include <stdint.h>
 
 #include "build/build_config.h"
 
 #if defined(GOOGLE_CHROME_BUILD) && !defined(OS_CHROMEOS)
 #include <gnu/libc-version.h>
 
 #include "base/sys_info.h"
 #include "base/version.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/chromium_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #endif
 
 // static
 bool ObsoleteSystem::IsObsoleteNowOrSoon() {
 #if defined(GOOGLE_CHROME_BUILD) && !defined(OS_CHROMEOS)
 #if defined(ARCH_CPU_32_BITS)
   return true;
 #else
   // Ubuntu 14.04 will be used as the next build platform, and it ships with
-  // glibc 2.19, so check for that as the minimum requirement.
+  // glibc 2.19. However, as of this writing, the binary produced on Ubuntu
+  // 14.04 does not actually require glibc 2.19. Thus this function checks for
+  // glibc 2.17 as the minimum requirement, so Ubuntu 12.04 (glibc 2.15) will
+  // be considered obsolete, but RHEL 7 (glibc 2.17) will not.
   Version version(gnu_get_libc_version());
   if (!version.IsValid() || version.components().size() != 2)
     return false;
 
   uint32_t glibc_major_version = version.components()[0];
   uint32_t glibc_minor_version = version.components()[1];
   if (glibc_major_version < 2)
     return true;
 
-  return glibc_major_version == 2 && glibc_minor_version < 19;
+  return glibc_major_version == 2 && glibc_minor_version < 17;
 #endif  // defined(ARCH_CPU_32_BITS)
 #else
   return false;
 #endif  // defined(GOOGLE_CHROME_BUILD) && !defined(OS_CHROMEOS)
 }
 
 // static
 base::string16 ObsoleteSystem::LocalizedObsoleteString() {
 #if defined(GOOGLE_CHROME_BUILD) && !defined(OS_CHROMEOS)
   const bool is_eol = IsEndOfTheLine();
@@ skipping 19 matching lines @@
 }
 
 // static
 const char* ObsoleteSystem::GetLinkURL() {
 #if defined(GOOGLE_CHROME_BUILD) && !defined(OS_CHROMEOS)
   return chrome::kLinuxWheezyPreciseDeprecationURL;
 #else
   return "";
 #endif
 }