To be fair this is probably the worst quarter for iOS sales. 2Q11 was when people were holding off for the 'iPhone 5' and 2Q12 is people holding off for the actual iPhone 5.
All of Google's gains in the last year appear to be from RIM and Symbian - perhaps that says something about the people who are switching from Blackberry and Nokia phones. Android is spread across a huge number of handsets, iOS is spread over 1 (2 if including the 3GS). If someone is looking for a cheaper smartphone, it'll be an Android. What's more amazing is Apple have a 20% market share with just one phone!
Anyway I don't think Apple wants nor needs to overtake Google in market share. What's more important is they are the market leader in profitability. These market share stats are calculated through internet browsing, but people actually spend more time a day on apps on smart phones. Apple makes more apps, more are downloaded and more money is made on each app by both Apple and the developer. Every $1.00 generated on iOS by an app corresponds to $0.24 in revenue for the Android version (Flurry Analytics).
For the profitability to change, we'd have to see developers make Android only apps. Which they won't, because making apps for iOS is more profitable for them, and so iOS is always their primary platform.