Use google.api instead of custom googleapi package

Use the standard google.api package to not create conflicts with other
proto definition that uses the same package.

Change-Id: Ic66a0a1a0f1e68c95fd94f443112ee4fb8b1bad5
diff --git a/VERSION b/VERSION
index 4360483..d9b058f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.3.2-dev
+4.0.0-dev