Safebrowsing: Honor the metadata from malware fullhash results in SB API 3.0.

chrome/browser/safe_browsing/BUILD.gn

Index: chrome/browser/safe_browsing/BUILD.gn
diff --git a/chrome/browser/safe_browsing/BUILD.gn b/chrome/browser/safe_browsing/BUILD.gn
index b6c750ea29278eeaacba3cc8febfec82b44f17d4..78781c8d50e7b0489ed9aab88b226f5e7120466d 100644
--- a/chrome/browser/safe_browsing/BUILD.gn
+++ b/chrome/browser/safe_browsing/BUILD.gn
@@ -9,6 +9,11 @@ proto_library("chunk_proto") {
   sources = [ "chunk.proto" ]
 }
 
+# GYP version: chrome/chrome_browser.gypi:safe_browsing_metadata_proto
+proto_library("metadata_proto") {
+  sources = [ "metadata.proto" ]
+}
+
 # GYP version: chrome/chrome_browser.gypi:safe_browsing_report_proto
 proto_library("report_proto") {
   sources = [ "report.proto" ]