WebSQL: Remove OriginInfo::DBInfo::last_modified.

The member is written, but never read.

Change-Id: I401c9e2b3c443ad1e31730a2862a485bfb4fd570
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2634863
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844915}

storage/browser/database/database_tracker.cc

@@ -67,14 +67,6 @@ int64_t OriginInfo::GetDatabaseSize(const base::string16& database_name) const {
   return 0;
 }
 
-base::Time OriginInfo::GetDatabaseLastModified(
-    const base::string16& database_name) const {
-  auto it = database_info_.find(database_name);
-  if (it != database_info_.end())
-    return it->second.last_modified;
-  return base::Time();
-}
-
 OriginInfo::OriginInfo(const std::string& origin_identifier, int64_t total_size)
     : origin_identifier_(origin_identifier), total_size_(total_size) {}
 
@@ -594,8 +586,7 @@ DatabaseTracker::CachedOriginInfo* DatabaseTracker::MaybeGetCachedOriginInfo(
       // TODO(jsbell): Avoid duplicate base::GetFileInfo calls between this and
       // the GetDBFileSize() call above.
       if (base::GetFileInfo(path, &file_info)) {
-        origin_info.SetDatabaseLastModified(db.database_name,
-                                            file_info.last_modified);
+        origin_info.UpdateLastModified(file_info.last_modified);
       }
     }
   }

storage/browser/database/database_tracker.h

@@ -57,12 +57,10 @@ class COMPONENT_EXPORT(STORAGE_BROWSER) OriginInfo {
   base::Time LastModified() const { return last_modified_; }
   void GetAllDatabaseNames(std::vector<base::string16>* databases) const;
   int64_t GetDatabaseSize(const base::string16& database_name) const;
-  base::Time GetDatabaseLastModified(const base::string16& database_name) const;
 
  protected:
   struct DBInfo {
     int64_t size;
-    base::Time last_modified;
   };
   OriginInfo(const std::string& origin_identifier, int64_t total_size);
 
@@ -201,9 +199,7 @@ class COMPONENT_EXPORT(STORAGE_BROWSER) DatabaseTracker
       if (new_size != old_size)
         total_size_ += new_size - old_size;
     }
-    void SetDatabaseLastModified(const base::string16& database_name,
-                                 const base::Time& last_modified) {
-      database_info_[database_name].last_modified = last_modified;
+    void UpdateLastModified(base::Time last_modified) {
       if (last_modified > last_modified_)
         last_modified_ = last_modified;
     }