Cleanup CXFA_TextData

This CL makes GetContent const.

Change-Id: I0dc3f939d265f4605a1bfb14020ca938d47f5602
Reviewed-on: https://pdfium-review.googlesource.com/19112
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>
diff --git a/xfa/fxfa/parser/cxfa_textdata.cpp b/xfa/fxfa/parser/cxfa_textdata.cpp
index adecd9c..a042853 100644
--- a/xfa/fxfa/parser/cxfa_textdata.cpp
+++ b/xfa/fxfa/parser/cxfa_textdata.cpp
@@ -10,6 +10,6 @@
 
 CXFA_TextData::CXFA_TextData(CXFA_Node* pNode) : CXFA_DataData(pNode) {}
 
-WideString CXFA_TextData::GetContent() {
+WideString CXFA_TextData::GetContent() const {
   return m_pNode->JSNode()->GetContent(false);
 }
diff --git a/xfa/fxfa/parser/cxfa_textdata.h b/xfa/fxfa/parser/cxfa_textdata.h
index 79ab48e..4a28a88 100644
--- a/xfa/fxfa/parser/cxfa_textdata.h
+++ b/xfa/fxfa/parser/cxfa_textdata.h
@@ -16,7 +16,7 @@
  public:
   explicit CXFA_TextData(CXFA_Node* pNode);
 
-  WideString GetContent();
+  WideString GetContent() const;
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_TEXTDATA_H_