Remove safe-browsing false-positive tracking.

chrome/browser/safe_browsing/safe_browsing_store.h

Index: chrome/browser/safe_browsing/safe_browsing_store.h
diff --git a/chrome/browser/safe_browsing/safe_browsing_store.h b/chrome/browser/safe_browsing/safe_browsing_store.h
index 917e3574feaf00ad002b0f1774e1b557102f7980..4ea8f8f950adc3c52b397f458749021739bf0274 100644
--- a/chrome/browser/safe_browsing/safe_browsing_store.h
+++ b/chrome/browser/safe_browsing/safe_browsing_store.h
@@ -146,11 +146,6 @@ void SBProcessSubs(SBAddPrefixes* add_prefixes,
                    const base::hash_set<int32>& add_chunks_deleted,
                    const base::hash_set<int32>& sub_chunks_deleted);
 
-// Records a histogram of the number of items in |prefix_misses| which
-// are not in |add_prefixes|.
-void SBCheckPrefixMisses(const SBAddPrefixes& add_prefixes,
-                         const std::set<SBPrefix>& prefix_misses);
-
 // TODO(shess): This uses int32 rather than int because it's writing
 // specifically-sized items to files.  SBPrefix should likewise be
 // explicitly sized.
@@ -234,12 +229,9 @@ class SafeBrowsingStore {
   // |pending_adds| is the set of full hashes which have been received
   // since the previous update, and is provided as a convenience
   // (could be written via WriteAddHash(), but that would flush the
-  // chunk to disk).  |prefix_misses| is the set of prefixes where the
-  // |GetHash()| request returned no full hashes, used for diagnostic
-  // purposes.
+  // chunk to disk).
   virtual bool FinishUpdate(
       const std::vector<SBAddFullHash>& pending_adds,
-      const std::set<SBPrefix>& prefix_misses,
       SBAddPrefixes* add_prefixes_result,
       std::vector<SBAddFullHash>* add_full_hashes_result) = 0;