vs2015: avoid int->float warning in printing/emf_win.cc

vs2015: avoid int->float warning in printing/emf_win.cc

d:\src\cr2\src\printing\emf_win.cc(548): warning C4838: conversion from 'int' to 'FLOAT' requires a narrowing conversion
d:\src\cr2\src\printing\emf_win.cc(569): warning C4838: conversion from 'int' to 'FLOAT' requires a narrowing conversion

R=alekseys@chromium.org
BUG=440500
Committed: https://crrev.com/76cb78651198ca8901524a7d2db70bc2a6521004
Cr-Commit-Position: refs/heads/master@{#327781}

[scottmg, 2015-04-30 17:18:39]

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

[commit-bot: I haz the power, 2015-04-30 17:19:01]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1113113002/1

[Aleksey Shlyapnikov, 2015-04-30 17:23:22]

lgtm

[scottmg, 2015-04-30 17:34:09]

The CQ bit was unchecked by scottmg@chromium.org

[scottmg, 2015-04-30 17:34:12]

The CQ bit was checked by scottmg@chromium.org

[commit-bot: I haz the power, 2015-04-30 17:35:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1113113002/1

[commit-bot: I haz the power, 2015-04-30 20:30:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-30 20:31:11]

Patchset 1 (id:??) landed as
https://crrev.com/76cb78651198ca8901524a7d2db70bc2a6521004
Cr-Commit-Position: refs/heads/master@{#327781}