According to research firm Chitika (via GigaOM), Google's Chrome browser for iOS now accounts for 3% of total iOS web traffic, up from 1.5% when it was first released for the platform in June 2012. The research attributes the browser's rise in usage to a release of the new version of Chrome optimized for iOS 7, an advertising campaign for the browser, and the release of the new iPhone 5s and iPhone 5c on September 20.While Chrome usage share on iOS devices rose only about 0.3 percentage points following September 22, keep in mind that iOS has an incredibly large existing user base meaning that usage changes need to be exceptionally great to cause a significant impact. I