Move full hash caching logic to v4_get_hash_protocol_manager

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 1e342f1b1eeb48ee659a8e7ae5ea70218e647b7c..9625f94da091a1dfdac73bcb69ae8ac705cf985d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -49909,12 +49909,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 <histogram name="SafeBrowsing.V4FullHashCacheResult"
     enum="SafeBrowsingV4FullHashCacheResult">
   <owner>kcarattini@chromium.org</owner>
+  <owner>vakh@chromium.org</owner>
   <summary>Track cache hits for V4 full hashes.</summary>
 </histogram>
 
 <histogram name="SafeBrowsing.V4GetHashCheckResult"
     enum="SafeBrowsingV4GetHashCheckResult">
   <owner>kcarattini@chromium.org</owner>
+  <owner>vakh@chromium.org</owner>
   <summary>Track get hash response hits for V4 full hash requests.</summary>
 </histogram>
 
@@ -92959,6 +92961,8 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="3" label="UNEXPECTED_PLATFORM_TYPE_ERROR"/>
   <int value="4" label="NO_METADATA_ERROR"/>
   <int value="5" label="INCONSISTENT_THREAT_TYPE_ERROR"/>
+  <int value="6" label="UNEXPECTED_METADATA_VALUE_ERROR"/>
+  <int value="7" label="NO_THREAT_ERROR"/>
 </enum>
 
 <enum name="SafeBrowsingParseV4UpdateResult" type="int">