Fixes for -Wunused-function on Linux, Android and ChromeOS

chrome/browser/download/save_package_file_picker.cc

Index: chrome/browser/download/save_package_file_picker.cc
diff --git a/chrome/browser/download/save_package_file_picker.cc b/chrome/browser/download/save_package_file_picker.cc
index 484e254a7a0634b6a2a36dbf979168c1228aac9d..d279978fdc8692cc01e0b9768bcea7e080ae585d 100644
--- a/chrome/browser/download/save_package_file_picker.cc
+++ b/chrome/browser/download/save_package_file_picker.cc
@@ -41,6 +41,7 @@ namespace {
 // exists only for testing.
 bool g_should_prompt_for_filename = true;
 
+#if !defined(OS_CHROMEOS)
 // Used for mapping between SavePageType constants and the indexes above.
 const SavePageType kIndexToSaveType[] = {
   content::SAVE_PAGE_TYPE_UNKNOWN,
@@ -56,6 +57,7 @@ int SavePackageTypeToIndex(SavePageType type) {
   NOTREACHED();
   return -1;
 }
+#endif
 
 // Indexes used for specifying which element in the extensions dropdown
 // the user chooses when picking a save type.