Another round of PDF plugin cleanups.

pdf/pdfium/pdfium_range.cc

 // Copyright (c) 2010 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 "pdf/pdfium/pdfium_range.h"
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "pdf/pdfium/pdfium_api_string_buffer_adapter.h"
 
@@ skipping 39 matching lines @@
   for (int i = 0; i < count; ++i) {
     double left, top, right, bottom;
     FPDFText_GetRect(page_->GetTextPage(), i, &left, &top, &right, &bottom);
     cached_screen_rects_.push_back(
         page_->PageToScreen(offset, zoom, left, top, right, bottom, rotation));
   }
 
   return cached_screen_rects_;
 }
 
-base::string16 PDFiumRange::GetText() {
+base::string16 PDFiumRange::GetText() const {
   int index = char_index_;
   int count = char_count_;
   base::string16 rv;
   if (count < 0) {
     count *= -1;
     index -= count - 1;
   }
 
   if (count > 0) {
     PDFiumAPIStringBufferAdapter<base::string16> api_string_adapter(&rv,
                                                                     count,
                                                                     false);
     unsigned short* data =
         reinterpret_cast<unsigned short*>(api_string_adapter.GetData());
     int written = FPDFText_GetText(page_->GetTextPage(), index, count, data);
     api_string_adapter.Close(written);
   }
 
   return rv;
 }
 
 }  // namespace chrome_pdf