Simplify EncodePageState to return no value.

content/common/page_state_serialization.h

 // 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.
 
 #ifndef CONTENT_COMMON_PAGE_STATE_SERIALIZATION_H_
 #define CONTENT_COMMON_PAGE_STATE_SERIALIZATION_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 53 matching lines @@
   // the files referenced by each frame.  See http://crbug.com/441966.
   std::vector<base::NullableString16> referenced_files;
   ExplodedFrameState top;
 
   ExplodedPageState();
   ~ExplodedPageState();
 };
 
 CONTENT_EXPORT bool DecodePageState(const std::string& encoded,
                                     ExplodedPageState* exploded);
-CONTENT_EXPORT bool EncodePageState(const ExplodedPageState& exploded,
+CONTENT_EXPORT void EncodePageState(const ExplodedPageState& exploded,
                                     std::string* encoded);
 
 #if defined(OS_ANDROID)
 CONTENT_EXPORT bool DecodePageStateWithDeviceScaleFactorForTesting(
     const std::string& encoded,
     float device_scale_factor,
     ExplodedPageState* exploded);
 
 // Converts results of EncodeResourceRequestBody (passed in as a pair of |data|
 // + |size|) back into a ResourceRequestBodyImpl.  Returns nullptr if the
 // decoding fails (e.g. if |data| is malformed).
 scoped_refptr<ResourceRequestBodyImpl> DecodeResourceRequestBody(
     const char* data,
     size_t size);
 
 // Encodes |resource_request_body| into |encoded|.
 std::string EncodeResourceRequestBody(
     const ResourceRequestBodyImpl& resource_request_body);
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_PAGE_STATE_SERIALIZATION_H_