[content shell] remove spurious printf format

content/shell/webkit_test_runner_host.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 "content/shell/webkit_test_runner_host.h"
 
 #include <iostream>
 
 #include "base/command_line.h"
 #include "base/message_loop.h"
@@ skipping 49 matching lines @@
     error_->flush();
   }
   state_ = IN_IMAGE_BLOCK;
 }
 
 void WebKitTestResultPrinter::PrintImageHeader(
     const std::string& actual_hash,
     const std::string& expected_hash) {
   if (state_ != IN_IMAGE_BLOCK || capture_text_only_)
     return;
-  *output_ << "\nActualHash: " << actual_hash << "%s\n";
+  *output_ << "\nActualHash: " << actual_hash << "\n";
   if (!expected_hash.empty())
-    *output_ << "\nExpectedHash: " << expected_hash << "%s\n";
+    *output_ << "\nExpectedHash: " << expected_hash << "\n";
 }
 
 void WebKitTestResultPrinter::PrintImageBlock(
     const std::vector<unsigned char>& png_image) {
   if (state_ != IN_IMAGE_BLOCK || capture_text_only_)
     return;
   *output_ << "Content-Type: image/png\n";
   *output_ << "Content-Length: " << png_image.size() << "\n";
   output_->write(
       reinterpret_cast<const char*>(&png_image[0]), png_image.size());
@@ skipping 295 matching lines @@
   WebKitTestController::Get()->WaitUntilDone();
 }
 
 void WebKitTestRunnerHost::OnNotImplemented(
     const std::string& object_name,
     const std::string& property_name) {
   WebKitTestController::Get()->NotImplemented(object_name, property_name);
 }
 
 }  // namespace content