The easiest way is to simply start the emulator, go to settings -> applications . Then select unnecessary applications and uninstall them.
Alternatively, you can make adb -e shell while the emulator is running, find the .apk files in the file system (I think they are under / system / apps) and delete them manually.
One final solution is in Eclipse Android Plugin (ADT), go to the file manager, find the .apk files and delete them.
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