I posted this elsewhere but thought i would post it here too.
I too have had the same problem the last few weeks with these exact same pop ups. The only unusual thing I recall doing recently is downloading some playstore apps from TapJoy to get jewels in the game castle clash. I figured the playstore apps were safe. But in retrospect, tapjoy seems to have a lot of suspect clients.
If you download the apps from playstore you still my not get your jewels as promised by Tapjoy - it varies. Complaining to Tapjoy does absolutely nothing. After having this happen a few times, I realized that Tapjoy has a lot of slimy clients and Tapjoy doesn't care. This led to me to believe that I got this malware from one of tapjoy's client's apps but I have removed all of these apps and the problem persists.
Anyway, one of the weblinks that pops up in my chrome browser is Android Clean Master
By the way, I input the hyperlink above as a long weblink "http://android-support.us/2010/11/index.php?c=66&l=389&subid=2117273431" and this site turned it into a hyperlink called "android clean master" when I posted it.
This link will take you to on the pop up you will be taken to
http://2solution.net/trc/go.php?c=66...bid=2117273431 Then you will be immediately redirected to the playstore.
The playstore app, some junk called DU speed booster, which i never downloaded, has more positive reviews than any app you have ever seen. It's BS tho. But when I try to write a negative review, it always says an error has occurred.
I am even more surprise that over the last few weeks, no solutions have emerged when repeatedly scouring the net for answers. It is scary because after 3 years on android this is the first problem of this type I have encountered but none of the playstore anti-virus anti malware stuff has been able to even identify a problem.