resource_bundle: Made all DecompressData functions const

Bug: 1003433
Change-Id: Ia9269aa8c8bcf2aad69c57fa5746d9e26c21cc65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1802391Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Auto-Submit: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697390}

ui/base/resource/resource_bundle.cc

@@ -632,19 +632,20 @@ base::StringPiece ResourceBundle::GetRawDataResourceForScale(
   return base::StringPiece();
 }
 
-std::string ResourceBundle::DecompressDataResource(int resource_id) {
+std::string ResourceBundle::DecompressDataResource(int resource_id) const {
   return DecompressDataResourceScaled(resource_id, ui::SCALE_FACTOR_NONE);
 }
 
 std::string ResourceBundle::DecompressDataResourceScaled(
     int resource_id,
-    ScaleFactor scaling_factor) {
+    ScaleFactor scaling_factor) const {
   std::string output;
   Decompress(GetRawDataResourceForScale(resource_id, scaling_factor), &output);
   return output;
 }
 
-std::string ResourceBundle::DecompressLocalizedDataResource(int resource_id) {
+std::string ResourceBundle::DecompressLocalizedDataResource(
+    int resource_id) const {
   base::AutoLock lock_scope(*locale_resources_data_lock_);
   base::StringPiece data;
   if (!(locale_resources_data_.get() &&

ui/base/resource/resource_bundle.h

@@ -254,16 +254,16 @@ class UI_BASE_EXPORT ResourceBundle {
   // into a newly allocated string given the resource id. Todo: Look into
   // introducing an Async version of this function in the future.
   // Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=973417
-  std::string DecompressDataResource(int resource_id);
+  std::string DecompressDataResource(int resource_id) const;
 
   // Return the contents of a scale dependent resource, decompressed into
   // a newly allocated string given the resource id.
   std::string DecompressDataResourceScaled(int resource_id,
-                                           ScaleFactor scaling_factor);
+                                           ScaleFactor scaling_factor) const;
 
   // Return the contents of a localized resource, decompressed into a
   // newly allocated string given the resource id.
-  std::string DecompressLocalizedDataResource(int resource_id);
+  std::string DecompressLocalizedDataResource(int resource_id) const;
 
   // Get a localized string given a message id.  Returns an empty string if the
   // resource_id is not found.