gerrit-plugin-api/BUILD: Remove unused SRCS variable

Change-Id: Ic17d8cf2751eec259ee65ac72ef85845aad7347b
diff --git a/gerrit-plugin-api/BUILD b/gerrit-plugin-api/BUILD
index 51b1486..fe9ce19 100644
--- a/gerrit-plugin-api/BUILD
+++ b/gerrit-plugin-api/BUILD
@@ -1,9 +1,3 @@
-SRCS = [
-    "gerrit-server/src/main/java/",
-    "gerrit-httpd/src/main/java/",
-    "gerrit-sshd/src/main/java/",
-]
-
 PLUGIN_API = [
     "//gerrit-httpd:httpd",
     "//gerrit-pgm:init-api",