vs2015: fix pvoid->dword truncation warning

vs2015: fix pvoid->dword truncation warning

FAILED: ninja -t msvc -e environment.x64 -- "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\amd64\cl.exe" /nologo /showIncludes /FC @obj\base\win\base_static_win64.pe_image.obj.rsp /c ..\..\base\win\pe_image.cc /Foobj\base\win\base_static_win64.pe_image.obj /Fdobj\base\base_static_win64.cc.pdb
d:\src\cr2\src\base\win\pe_image.cc(571): error C2220: warning treated as error - no 'object' file generated
d:\src\cr2\src\base\win\pe_image.cc(571): warning C4311: 'reinterpret_cast': pointer truncation from 'LPVOID' to 'DWORD'
d:\src\cr2\src\base\win\pe_image.cc(571): warning C4302: 'reinterpret_cast': truncation from 'LPVOID' to 'DWORD'
d:\src\cr2\src\base\win\pe_image.cc(573): warning C4311: 'reinterpret_cast': pointer truncation from 'PVOID' to 'DWORD'
d:\src\cr2\src\base\win\pe_image.cc(573): warning C4302: 'reinterpret_cast': truncation from 'PVOID' to 'DWORD'

R=cpu@chromium.org
BUG=440500
Committed: https://crrev.com/1f59a1eadbc6a3ab6d03b3c8380a5bc0f83c9eba
Cr-Commit-Position: refs/heads/master@{#327404}

[scottmg, 2015-04-28 20:32:52]

The CQ bit was checked by scottmg@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-04-28 20:33:33]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1117433003/1

[Will Harris, 2015-04-28 20:35:07]

see also crbug.com/390958

[commit-bot: I haz the power, 2015-04-28 21:42:40]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-04-28 21:42:41]

Dry run: This issue passed the CQ dry run.

[cpu_(ooo_6.6-7.5), 2015-04-29 00:31:13]

lgtm

[cpu_(ooo_6.6-7.5), 2015-04-29 00:31:16]

The CQ bit was checked by cpu@chromium.org

[commit-bot: I haz the power, 2015-04-29 00:33:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1117433003/1

[commit-bot: I haz the power, 2015-04-29 00:36:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-29 00:37:32]

Patchset 1 (id:??) landed as
https://crrev.com/1f59a1eadbc6a3ab6d03b3c8380a5bc0f83c9eba
Cr-Commit-Position: refs/heads/master@{#327404}