Make java_binary common variant a dependency

ctx.PrimaryModule() is wrong in the case of a java_binary that
supports both host and device, use an explicit dependency instead.
Once the dependency exists there is no need to manually request
the jar be installed, it will automatically be installed by the
host installation rules for dependencies.

Test: TestBinary
Change-Id: Iddeea2d08bc574c79d42139020558cd70d718ca1
diff --git a/java/java.go b/java/java.go
index b06e604..615cbad 100644
--- a/java/java.go
+++ b/java/java.go
@@ -2472,12 +2472,11 @@
 			j.wrapperFile = android.PathForSource(ctx, "build/soong/scripts/jar-wrapper.sh")
 		}
 
-		// Depend on the installed jar so that the wrapper doesn't get executed by
-		// another build rule before the jar has been installed.
-		jarFile := ctx.PrimaryModule().(*Binary).installFile
-
+		// The host installation rules make the installed wrapper depend on all the dependencies
+		// of the wrapper variant, which will include the common variant's jar file.  This is
+		// verified by TestBinary.
 		j.binaryFile = ctx.InstallExecutable(android.PathForModuleInstall(ctx, "bin"),
-			ctx.ModuleName(), j.wrapperFile, jarFile)
+			ctx.ModuleName(), j.wrapperFile)
 	}
 }