Simplify EncodePageState to return no value.

content/renderer/history_serialization.cc

Index: content/renderer/history_serialization.cc
diff --git a/content/renderer/history_serialization.cc b/content/renderer/history_serialization.cc
index ee5981afa3fdede74589a74bd82311a614c5f09e..45855c15fc7bfc8b3e37e49b388f4203ab5448de 100644
--- a/content/renderer/history_serialization.cc
+++ b/content/renderer/history_serialization.cc
@@ -122,9 +122,7 @@ PageState HistoryEntryToPageState(HistoryEntry* entry) {
                                 &state.referenced_files);
 
   std::string encoded_data;
-  if (!EncodePageState(state, &encoded_data))
-    return PageState();
-
+  EncodePageState(state, &encoded_data);
   return PageState::CreateFromEncodedData(encoded_data);
 }
 
@@ -135,9 +133,7 @@ PageState SingleHistoryItemToPageState(const WebHistoryItem& item) {
   GenerateFrameStateFromItem(item, &state.top);
 
   std::string encoded_data;
-  if (!EncodePageState(state, &encoded_data))
-    return PageState();
-
+  EncodePageState(state, &encoded_data);
   return PageState::CreateFromEncodedData(encoded_data);
 }