downloads: Improve download rate estimation.

content/browser/download/base_file.cc

Index: content/browser/download/base_file.cc
diff --git a/content/browser/download/base_file.cc b/content/browser/download/base_file.cc
index 687c321c9c8d212d983b4492399ef8de41a0ad80..e649eedfe2df51c48fb7ed10c4849d7e39fd89c2 100644
--- a/content/browser/download/base_file.cc
+++ b/content/browser/download/base_file.cc
@@ -218,11 +218,6 @@ DownloadInterruptReason BaseFile::AnnotateWithSourceInformation() {
 }
 #endif
 
-int64 BaseFile::CurrentSpeed() const {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
-  return CurrentSpeedAtTime(base::TimeTicks::Now());
-}
-
 bool BaseFile::GetHash(std::string* hash) {
   DCHECK(!detached_);
   hash->assign(reinterpret_cast<const char*>(sha256_hash_),
@@ -339,12 +334,6 @@ void BaseFile::ClearStream() {
   bound_net_log_.EndEvent(net::NetLog::TYPE_DOWNLOAD_FILE_OPENED);
 }
 
-int64 BaseFile::CurrentSpeedAtTime(base::TimeTicks current_time) const {
-  base::TimeDelta diff = current_time - start_tick_;
-  int64 diff_ms = diff.InMilliseconds();
-  return diff_ms == 0 ? 0 : bytes_so_far() * 1000 / diff_ms;
-}
-
 DownloadInterruptReason BaseFile::LogNetError(
     const char* operation,
     net::Error error) {