[M108 Migration] Change the Web Page scroll interval using the Keyboard 4 direction key

[M108 Migration] Change the Web Page scroll interval using the Keyboard 4 direction key

It's the requirement from WebBrowser:
There is no feeling of scrolling quickly by the keyboard 4 direction key.
This part is probably the acceleration effect when 4 direction key is input by keyboard.
Please change the Web Page scroll interval using the Keyboard 4 direction key.

Need change the kPixelsPerLineStep from 40px to 140px

Reference:
https://review.tizen.org/gerrit/#/c/platform/framework/web/chromium-efl/+/285465/

Change-Id: I00fe3bad46e938d351ce5eb42a1c56be00369d2a
Signed-off-by: wangjing <jing124.wang@samsung.com>