Revert of Always prefer 192x192 on mobile, also for touch icons

Revert of Always prefer 192x192 on mobile, also for touch icons (patchset #2 id:20001 of https://codereview.chromium.org/2972643002/ )

Reason for revert:
Perf regression, suspect of accidentally fixing a bug that was believed to be previously fixed (crbug.com/735354) due to the max image size used during download.

BUG=749331
Original issue's description:
> Always prefer 192x192 on mobile, also for touch icons
> 
> Previously, the ideal size for a touch icon was 144x144, which was
> originally introduced honoring iPad icon size.
> 
> Always going for 192x192 (for both touch and non-touch icons) is
> simpler, more consistent and more compatible with Apple's current
> recommendations for iOS [1], which for example recommend a 180x180 icon
> for iPhone 6 Plus (scale factor of 3x).
> 
> [1] https://developer.apple.com/ios/human-interface-guidelines/graphics/app-icon/
> 
> BUG=736290
> 
> Review-Url: https://codereview.chromium.org/2972643002
> Cr-Commit-Position: refs/heads/master@{#488935}
> Committed: https://chromium.googlesource.com/chromium/src/+/c63d78c7a25a50f2fdfa0ab5cbb5566a21a6774e

TBR=pkotwicz@chromium.org,noyau@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=736290
Review-Url: https://codereview.chromium.org/2986033002
Cr-Commit-Position: refs/heads/master@{#489971}
Committed: https://chromium.googlesource.com/chromium/src/+/195ee4a01e7dfb6a1a13a32e01526464e7715f12

[mastiz, 2017-07-27 15:29:55]

The CQ bit was checked by mastiz@chromium.org

[mastiz, 2017-07-27 15:29:55]

Created Revert of Always prefer 192x192 on mobile, also for touch icons

[commit-bot: I haz the power, 2017-07-27 15:30:07]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-07-27 16:39:54]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1501169395225950, "parent_rev":
"24bd4066e46f42bdafe467100538f4c6e940ff55", "commit_rev":
"fd78048787d2cb88d819b96f5e0643f668541a28"}

[commit-bot: I haz the power, 2017-07-27 16:40:15]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1501169395225950, "parent_rev":
"4080e94e09abb06a783aa34fed5d167b41282cc2", "commit_rev":
"195ee4a01e7dfb6a1a13a32e01526464e7715f12"}

[commit-bot: I haz the power, 2017-07-27 16:40:44]

Description was changed from

==========
Revert of Always prefer 192x192 on mobile, also for touch icons (patchset #2
id:20001 of https://codereview.chromium.org/2972643002/ )

Reason for revert:
Perf regression, suspect of accidentally fixing a bug that was believed to be
previously fixed (crbug.com/735354) due to the max image size used during
download.

BUG=749331

Original issue's description:
> Always prefer 192x192 on mobile, also for touch icons
> 
> Previously, the ideal size for a touch icon was 144x144, which was
> originally introduced honoring iPad icon size.
> 
> Always going for 192x192 (for both touch and non-touch icons) is
> simpler, more consistent and more compatible with Apple's current
> recommendations for iOS [1], which for example recommend a 180x180 icon
> for iPhone 6 Plus (scale factor of 3x).
> 
> [1]
https://developer.apple.com/ios/human-interface-guidelines/graphics/app-icon/
> 
> BUG=736290
> 
> Review-Url: https://codereview.chromium.org/2972643002
> Cr-Commit-Position: refs/heads/master@{#488935}
> Committed:
https://chromium.googlesource.com/chromium/src/+/c63d78c7a25a50f2fdfa0ab5cbb5...

TBR=pkotwicz@chromium.org,noyau@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=736290
==========

to

==========
Revert of Always prefer 192x192 on mobile, also for touch icons (patchset #2
id:20001 of https://codereview.chromium.org/2972643002/ )

Reason for revert:
Perf regression, suspect of accidentally fixing a bug that was believed to be
previously fixed (crbug.com/735354) due to the max image size used during
download.

BUG=749331

Original issue's description:
> Always prefer 192x192 on mobile, also for touch icons
> 
> Previously, the ideal size for a touch icon was 144x144, which was
> originally introduced honoring iPad icon size.
> 
> Always going for 192x192 (for both touch and non-touch icons) is
> simpler, more consistent and more compatible with Apple's current
> recommendations for iOS [1], which for example recommend a 180x180 icon
> for iPhone 6 Plus (scale factor of 3x).
> 
> [1]
https://developer.apple.com/ios/human-interface-guidelines/graphics/app-icon/
> 
> BUG=736290
> 
> Review-Url: https://codereview.chromium.org/2972643002
> Cr-Commit-Position: refs/heads/master@{#488935}
> Committed:
https://chromium.googlesource.com/chromium/src/+/c63d78c7a25a50f2fdfa0ab5cbb5...

TBR=pkotwicz@chromium.org,noyau@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=736290

Review-Url: https://codereview.chromium.org/2986033002
Cr-Commit-Position: refs/heads/master@{#489971}
Committed:
https://chromium.googlesource.com/chromium/src/+/195ee4a01e7dfb6a1a13a32e0152...
==========

[commit-bot: I haz the power, 2017-07-27 16:40:45]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/195ee4a01e7dfb6a1a13a32e0152...