Renamed "symbols" to "internalized strings" throughout the code base,

src/json-parser.h

Index: src/json-parser.h
diff --git a/src/json-parser.h b/src/json-parser.h
index ccb32866f9268d3e7fc780d811fbdb1da8fdf6d3..aab3ca452030fab93602acfa2213f789fb4b17e6 100644
--- a/src/json-parser.h
+++ b/src/json-parser.h
@@ -345,7 +345,7 @@ Handle<Object> JsonParser<seq_ascii>::ParseJsonObject() {
       Handle<Object> value = ParseJsonValue();
       if (value.is_null()) return ReportUnexpectedCharacter();
 
-      if (key->Equals(isolate()->heap()->Proto_symbol())) {
+      if (key->Equals(isolate()->heap()->proto_string())) {
         prototype = value;
       } else {
         if (JSObject::TryTransitionToField(json_object, key)) {
@@ -652,12 +652,12 @@ Handle<String> JsonParser<seq_ascii>::ScanJsonString() {
         ? StringHasher::GetHashCore(running_hash) : length;
     Vector<const uint8_t> string_vector(
         seq_source_->GetChars() + position_, length);
-    SymbolTable* symbol_table = isolate()->heap()->symbol_table();
-    uint32_t capacity = symbol_table->Capacity();
-    uint32_t entry = SymbolTable::FirstProbe(hash, capacity);
+    StringTable* string_table = isolate()->heap()->string_table();
+    uint32_t capacity = string_table->Capacity();
+    uint32_t entry = StringTable::FirstProbe(hash, capacity);
     uint32_t count = 1;
     while (true) {
-      Object* element = symbol_table->KeyAt(entry);
+      Object* element = string_table->KeyAt(entry);
       if (element == isolate()->heap()->undefined_value()) {
         // Lookup failure.
         break;
@@ -670,7 +670,7 @@ Handle<String> JsonParser<seq_ascii>::ScanJsonString() {
         AdvanceSkipWhitespace();
         return Handle<String>(String::cast(element), isolate());
       }
-      entry = SymbolTable::NextProbe(entry, count++, capacity);
+      entry = StringTable::NextProbe(entry, count++, capacity);
     }
   }
 
@@ -696,7 +696,7 @@ Handle<String> JsonParser<seq_ascii>::ScanJsonString() {
   int length = position_ - beg_pos;
   Handle<String> result;
   if (seq_ascii && is_symbol) {
-    result = factory()->LookupOneByteSymbol(seq_source_, beg_pos, length);
+    result = factory()->InternalizeOneByteString(seq_source_, beg_pos, length);
   } else {
     result = factory()->NewRawOneByteString(length, pretenure_);
     uint8_t* dest = SeqOneByteString::cast(*result)->GetChars();