[This CL = CL 1399843003 + disabling E4267 for MSVS (in safe_browsing_db.gypi)]

Move prefix_set and parts of safe_browsing_util into a new component
safe_browsing_db.
This component will hold the new implementation for the
next version (pver4) of the update protocol and DB.

BUG=543161

Review URL: https://codereview.chromium.org/1415923004

Cr-Commit-Position: refs/heads/master@{#356943}
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index a25c23f..a0c1bd3 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -298,6 +298,7 @@
       "//components/plugins/common",
       "//components/proxy_config",
       "//components/resources",
+      "//components/safe_browsing_db",
       "//components/safe_json",
       "//components/sessions",
       "//components/ssl_config",