Incrementing VERSION to 49.0.2588.6

Cr-Commit-Position: refs/branch-heads/2588@{#11}
Cr-Branched-From: 407fbf7cdb2c18d9032f75ce20bb70c2c5f67c7e-refs/heads/master@{#364574}
diff --git a/chrome/VERSION b/chrome/VERSION
index a0ff1fe..a693725 100644
--- a/chrome/VERSION
+++ b/chrome/VERSION
@@ -1,4 +1,4 @@
 MAJOR=49
 MINOR=0
 BUILD=2588
-PATCH=5
+PATCH=6