Reserve 1GB at the base address of linux nacl_helper for Native Client.

chrome/common/chrome_paths.h

Index: chrome/common/chrome_paths.h
diff --git a/chrome/common/chrome_paths.h b/chrome/common/chrome_paths.h
index 43140ea38978084dae4ce5deb01ce2c4eba81fbc..e1978f1940c92e000ca8eb0255e2070d8c2e6980 100644
--- a/chrome/common/chrome_paths.h
+++ b/chrome/common/chrome_paths.h
@@ -68,6 +68,10 @@ enum {
   FILE_FLASH_PLUGIN,            // Full path to the internal Flash plugin file.
   FILE_PEPPER_FLASH_PLUGIN,     // Full path to the pepper Flash plugin file.
   FILE_PDF_PLUGIN,              // Full path to the internal PDF plugin file.
+
+#if !defined(OS_MACOSX) && defined(OS_POSIX)
+  FILE_NACL_HELPER,             // Full path to Linux nacl_helper executable.
+#endif
   FILE_NACL_PLUGIN,             // Full path to the internal NaCl plugin file.
   FILE_LIBAVCODEC,              // Full path to libavcodec media decoding
                                 // library.