Suppress VS 2015 pointer truncation warning.

base/win/pe_image.cc

Index: base/win/pe_image.cc
diff --git a/base/win/pe_image.cc b/base/win/pe_image.cc
index e226b6a67072025c0e090ef22db9d421b7fdcd30..19b381d6fe6da271a0c2b02e52ac528bb0928889 100644
--- a/base/win/pe_image.cc
+++ b/base/win/pe_image.cc
@@ -568,14 +568,12 @@ bool PEImage::ImageAddrToOnDiskOffset(LPVOID address,
   if (NULL == section_header)
     return false;
 
-#pragma warning(push)
-#pragma warning(disable: 4311)
+#pragma warning(suppress : 4302) // pointer truncation
   // These casts generate warnings because they are 32 bit specific.
   // Don't follow the virtual RVAToAddr, use the one on the base.
   DWORD offset_within_section = reinterpret_cast<DWORD>(address) -
                                     reinterpret_cast<DWORD>(PEImage::RVAToAddr(
                                         section_header->VirtualAddress));
-#pragma warning(pop)
 
   *on_disk_offset = section_header->PointerToRawData + offset_within_section;
   return true;