Coverity: Fix a pass-by-value.

chrome/browser/visitedlink/visitedlink_master.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/visitedlink/visitedlink_master.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <io.h>
 #include <shlobj.h>
@@ skipping 47 matching lines @@
 // Fills the given salt structure with some quasi-random values
 // It is not necessary to generate a cryptographically strong random string,
 // only that it be reasonably different for different users.
 void GenerateSalt(uint8 salt[LINK_SALT_LENGTH]) {
   DCHECK_EQ(LINK_SALT_LENGTH, 8) << "This code assumes the length of the salt";
   uint64 randval = base::RandUint64();
   memcpy(salt, &randval, 8);
 }
 
 // Opens file on a background thread to not block UI thread.
-void AsyncOpen(FILE** file, FilePath filename) {
+void AsyncOpen(FILE** file, const FilePath& filename) {
   *file = OpenFile(filename, "wb+");
   DLOG_IF(ERROR, !(*file)) << "Failed to open file " << filename.value();
 }
 
 // Returns true if the write was complete.
 static bool WriteToFile(FILE* file,
                         off_t offset,
                         const void* data,
                         size_t data_len) {
   if (fseek(file, offset, SEEK_SET) != 0)
@@ skipping 893 matching lines @@
 }
 
 void VisitedLinkMaster::TableBuilder::OnCompleteMainThread() {
   if (master_)
     master_->OnTableRebuildComplete(success_, fingerprints_);
 
   // WILL (generally) DELETE THIS! This balances the AddRef in
   // VisitedLinkMaster::RebuildTableFromHistory.
   Release();
 }