libmetrics: remove version 180609

BUG=chromium:361748
CQ-DEPEND=CL:195565
CQ-DEPEND=CL:195570
CQ-DEPEND=CL:195548
TEST=Trybot runs on paladin, release and chromiumos-sdk builders.

Change-Id: I09fdbdad6752ced19bc0dc6cfecdc67f1867c2cf
Reviewed-on: https://chromium-review.googlesource.com/195580
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
diff --git a/libmetrics-180609.gyp b/libmetrics-180609.gyp
deleted file mode 100644
index 4226712..0000000
--- a/libmetrics-180609.gyp
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  'variables': {
-    'libbase_ver': 180609,
-  },
-  'includes': [
-    '../metrics/libmetrics.gypi',
-  ],
-}