Move GenericAccountService to common/src/java

Change-Id: I3a430084450b1e2035d3a550c535962dc5901bb8
diff --git a/common/src/com/example/android/common/accounts/GenericAccountService.java b/common/src/java/com/example/android/common/accounts/GenericAccountService.java
similarity index 100%
rename from common/src/com/example/android/common/accounts/GenericAccountService.java
rename to common/src/java/com/example/android/common/accounts/GenericAccountService.java