Disable page zoom through control+scroll on Mac.

Disable page zoom through control+scroll on Mac.

I accidentally enabled this on Mac in r181965. However on Mac this has an unintended consequence of changing the page zoom when the user starts inertial scrolling and presses control right after.

BUG=178972
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=194942

[Nico, 2013-04-17 23:48:41]

lgtm for mac, thanks for the quick fix!

I also noticed the same issue on my Chromebook Pixel and found it slightly
annoying: I'd two-finger-scroll a web page, and while it's still scrolling press
ctrl with the intent to ctrl-click a link to open it in a new tab, and the zoom
level changed. Maybe it's not a regression there though. Thoughts on CrOs?

I guess on Windows it's not an issue because two-finger-scroll trackpads aren't
as common there.

[jam, 2013-04-18 00:17:22]

On 2013/04/17 23:48:41, Nico wrote:
> lgtm for mac, thanks for the quick fix!
> 
> I also noticed the same issue on my Chromebook Pixel and found it slightly
> annoying: I'd two-finger-scroll a web page, and while it's still scrolling
press
> ctrl with the intent to ctrl-click a link to open it in a new tab, and the
zoom
> level changed. Maybe it's not a regression there though. Thoughts on CrOs?

I can't tell whether my change caused this or not, as I'm not setup for building
and testing on a cros device. I'll ping cros people about this.

> 
> I guess on Windows it's not an issue because two-finger-scroll trackpads
aren't
> as common there.

I think another issue to consider is whether the OS delivers these buffered
mouse wheel events with a control modifier or not. It seems odd that they would
come with the modifier even though the user never scrolled and held control at
the same time.