Remove redundant c_str() calls.

chrome/browser/android/history_report/delta_file_backend_leveldb.cc

 // Copyright 2015 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/android/history_report/delta_file_backend_leveldb.h"
 
 #include <inttypes.h>
 
 #include "base/files/file_util.h"
 #include "base/logging.h"
@@ skipping 101 matching lines @@
   return false;
 }
 
 bool DeltaFileBackend::EnsureInitialized() {
   if (db_.get()) return true;
   return Init();
 }
 
 void DeltaFileBackend::PageAdded(const GURL& url) {
   if (!EnsureInitialized()) return;
-  SaveChange(db_.get(), url.spec().c_str(), "add");
+  SaveChange(db_.get(), url.spec(), "add");
 }
 
 void DeltaFileBackend::PageDeleted(const GURL& url) {
   if (!EnsureInitialized()) return;
-  SaveChange(db_.get(), url.spec().c_str(), "del");
+  SaveChange(db_.get(), url.spec(), "del");
 }
 
 int64_t DeltaFileBackend::Trim(int64_t lower_bound) {
   if (!EnsureInitialized()) return -1;
   leveldb::ReadOptions read_options;
   std::unique_ptr<leveldb::Iterator> db_iter(db_->NewIterator(read_options));
   db_iter->SeekToFirst();
   if (!db_iter->Valid())
     return -1;
   history_report::DeltaFileEntry first_entry;
@@ skipping 94 matching lines @@
   leveldb::ReadOptions options;
   std::unique_ptr<leveldb::Iterator> db_it(db_->NewIterator(options));
   int num_entries = 0;
   for (db_it->SeekToFirst(); db_it->Valid(); db_it->Next()) num_entries++;
   dump.append(base::IntToString(num_entries));
   dump.append("]");
   return dump;
 }
 
 }  // namespace history_report