Update chromoting host icons

Update chromoting host icons

Update the host icons to the new style which includes the Chrome logo.
This affects all chromoting components, including the Android app and
the webapp.

All icons are based off the 512x512 PNG in the linked bug.

The smaller sizes were generated with ImageMagick, for example:
convert chromoting512.png -resize 48x48 chromoting48.png

ICO file was generated with:
convert chromoting16.png chromoting32.png chromoting48.png chromoting.ico

WebP versions were generated using cwebp:
for i in chromoting*.png; do \
  cwebp -lossless -q 100 -m 6 $i -o ${i%.png}.webp; done

Android empty_host_list icon was made by cropping 512x512 to 510x510,
then shrinking by a factor of 3, then converting to grayscale, then
darkening the image using GIMP and cropping to a few-pixels-wide
margin.

All PNGs were optimized by running:
tools/resources/optimize-png-files.sh -o2 remoting/resources

BUG=334830
R=jamiewalch@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=261530

[Sergey Ulanov, 2014-04-02 19:57:50]

The scaled images look blurry. Just tried scaling it in Gimp using Cubic and
Lanczos resampling - both give much better results.

[Jamie, 2014-04-02 20:54:34]

Since Sergey seems to be more discerning about these things than I am, I'm happy
to defer the review to him :)

[Sergey Ulanov, 2014-04-02 21:31:19]

On 2014/04/02 20:54:34, Jamie wrote:
> Since Sergey seems to be more discerning about these things than I am, I'm
happy
> to defer the review to him :)

Sorry, it turns out I had my browser zoomed in when reviewing this change.

[Jamie, 2014-04-03 00:30:31]

On 2014/04/02 21:31:19, Sergey Ulanov wrote:
> On 2014/04/02 20:54:34, Jamie wrote:
> > Since Sergey seems to be more discerning about these things than I am, I'm
> happy
> > to defer the review to him :)
> 
> Sorry, it turns out I had my browser zoomed in when reviewing this change.

In that case, LGTM.

[Lambros, 2014-04-03 21:32:34]

Committed patchset #1 manually as r261530 (presubmit successful).