While there are many services that claim to measure the market share for browsers, I tend to think that StatCounter is the most accurate. StatCounter's stats for 2008-2015 show that Chrome's market share grew from 0% to 53% in 7 years, while IE's share declined from 67% to 15%. According to StatCounter, Chrome is now the dominant browser, while IE and Firefox are continually losing market share.
It's clear that Google did a lot things right when it launched Chrome, but few people anticipated that Google's browser will take over the world. Most people didn't know what's a browser and only knew that they were supposed to click on the blue E icon to go online. Google changed this by promoting a constantly evolving browser, which was faster and more secure.