Add high-res Chromium logo for first-run.

Add high-res Chromium logo for first-run.

This replaces the blurry Chromium logo shown during first run with a
sharper version, and renames the image file from fre_chrome_logo.png to
fre_product_logo.png.

BUG=473881
Committed: https://crrev.com/c2c5c7a19f489ee3e8d7ddb203807233c1d2cf80
Cr-Commit-Position: refs/heads/master@{#328254}

[newt (away), 2015-05-05 00:48:47]

newt@chromium.org changed reviewers:
+ aurimas@chromium.org

[newt (away), 2015-05-05 00:48:48]

PTAL

[aurimas (slooooooooow), 2015-05-05 00:52:50]

lgtm

[newt (away), 2015-05-05 01:23:03]

The CQ bit was checked by newt@chromium.org

[commit-bot: I haz the power, 2015-05-05 01:24:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1126673005/1

[commit-bot: I haz the power, 2015-05-05 02:49:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-05 02:50:32]

Patchset 1 (id:??) landed as
https://crrev.com/c2c5c7a19f489ee3e8d7ddb203807233c1d2cf80
Cr-Commit-Position: refs/heads/master@{#328254}