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It would depend on the other rules. For instance if you have a rule that allows ESTABLISHED, RELATED (which is very common) and it is before the string match and it is set to ACCEPT then the packet would probably not hit the string rule. Because the google search was initiated by you so it became an ESTABLISHED connection and the page was loaded.
Distribution: Debian 3, 31r0, 4, slackware, DSL, RH8.0/7, MDK9/10, et al. Vista is cute but not Linux - I tried
You had the destination port in the rule for the INPUT not the source. As the data is coming from the other ends port 80 it is actually a source. If it where being requested from your computer then it would be a destination.