Incrementing VERSION to 43.0.2320.5

Cr-Commit-Position: refs/branch-heads/2320@{#5}
Cr-Branched-From: f8374835dce0647b918709d17d1e74f46c68ee3f-refs/heads/master@{#318669}
diff --git a/chrome/VERSION b/chrome/VERSION
index e812871..9e74e358 100644
--- a/chrome/VERSION
+++ b/chrome/VERSION
@@ -1,4 +1,4 @@
 MAJOR=43
 MINOR=0
 BUILD=2320
-PATCH=4
+PATCH=5