Fix “Deceptive Site Ahead” warning of a website using Google Webmaster Tool

Many of our customers were facing difficulties to resolve the Deceptive Site Ahead warning issue on their website. 
This article is provided as a courtesy to our customers, to help them to resolve the Deceptive Site Ahead warning issue on their website. Hope you will find it helpful. 
First, let's know the facts and then we will discuss the procedures to resolve the issue.

What Deceptive Site Ahead Warning & why does it appear?
Deceptive Site Ahead, warning message appears for a website when the web browsers find/assume that the website is infected with malware or a threat which is dangerous for the user to access. It processes the web site as an enormous chance of a data breach or cyber-attack.