NaCl: Support 64-bit reserved_at_zero value

This change will make the x86-32 sandbox on Linux non-zero-based until the change at http://codereview.chromium.org/10832040/ is committed in Chromium. Also, on Atom, performance will be temporarily reduced but not broken. 

BUG=http://code.google.com/p/nativeclient/issues/detail?id=2927
TEST=trybots

Review URL: https://chromiumcodereview.appspot.com/10826039

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149333 0039d316-1c4b-4281-b951-d872f2087c98

chrome/app/nacl_fork_delegate_linux.cc

@@ -33,7 +33,8 @@ NaClForkDelegate::NaClForkDelegate()
  * Note these need to match up with their counterparts in nacl_helper_linux.c
  * and nacl_helper_bootstrap_linux.c.
  */
-const char kNaClHelperReservedAtZero[] = "--reserved_at_zero=0xXXXXXXXX";
+const char kNaClHelperReservedAtZero[] =
+    "--reserved_at_zero=0xXXXXXXXXXXXXXXXX";
 const char kNaClHelperRDebug[] = "--r_debug=0xXXXXXXXXXXXXXXXX";
 
 void NaClForkDelegate::Init(const bool sandboxed,

chrome/nacl/nacl_helper_linux.cc

@@ -175,7 +175,7 @@ static void CheckRDebug(char *argv0) {
 }
 
 /*
- * The zygote passes --reserved_at_zero=0xXXXXXXXX.
+ * The zygote passes --reserved_at_zero=0xXXXXXXXXXXXXXXXX.
  * nacl_helper_bootstrap replaces the Xs with the amount of prereserved
  * sandbox memory.
  *