Fix "unreachable code" warning (MSVC warning 4702) in

chrome/utility/cloud_print/pwg_encoder.cc

 // Copyright 2013 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/utility/cloud_print/pwg_encoder.h"
 
 #include <algorithm>
 
 #include "base/big_endian.h"
 #include "base/logging.h"
@@ skipping 184 matching lines @@
 // put the compressed image data in the string.  Returns true on success.
 // The content of the string is undefined on failure.
 bool PwgEncoder::EncodePage(const BitmapImage& image,
                             const PwgHeaderInfo& pwg_header_info,
                             std::string* output) const {
   // pwg_header_info.color_space can only contain color spaces that are
   // supported, so no sanity check is needed.
   switch (image.colorspace()) {
     case BitmapImage::RGBA:
       return EncodePageWithColorspace<RGBA8>(image, pwg_header_info, output);
-      break;
+
     case BitmapImage::BGRA:
       return EncodePageWithColorspace<BGRA8>(image, pwg_header_info, output);
-      break;
+
     default:
       LOG(ERROR) << "Unsupported colorspace.";
       return false;
   }
-
-  EncodePageHeader(image, pwg_header_info, output);
 }
 
 template <typename InputStruct>
 bool PwgEncoder::EncodePageWithColorspace(const BitmapImage& image,
                                           const PwgHeaderInfo& pwg_header_info,
                                           std::string* output) const {
   bool monochrome = pwg_header_info.color_space == PwgHeaderInfo::SGRAY;
   EncodePageHeader(image, pwg_header_info, output);
 
   // Ensure no integer overflow.
@@ skipping 30 matching lines @@
       EncodeRow<InputStruct>(std::reverse_iterator<const uint32*>(row_end),
                              std::reverse_iterator<const uint32*>(pos),
                              monochrome,
                              output);
     }
   }
   return true;
 }
 
 }  // namespace cloud_print