Unify HasGDocFileExtension and IsHostedDocumentByExtentoin.

chrome/browser/chromeos/drive/file_system_util.cc

Index: chrome/browser/chromeos/drive/file_system_util.cc
diff --git a/chrome/browser/chromeos/drive/file_system_util.cc b/chrome/browser/chromeos/drive/file_system_util.cc
index ca85c5297d918d70701181377b91b7754a9a829e..f20dbf7bf9b0ef000fe3d25a78308be90eab1a7c 100644
--- a/chrome/browser/chromeos/drive/file_system_util.cc
+++ b/chrome/browser/chromeos/drive/file_system_util.cc
@@ -29,7 +29,6 @@
 #include "chrome/browser/chromeos/drive/write_on_cache_file.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/chromeos/profiles/profile_util.h"
-#include "chrome/browser/drive/drive_api_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/chrome_constants.h"
@@ -344,11 +343,6 @@ bool CreateGDocFile(const base::FilePath& file_path,
       static_cast<int>(content.size());
 }
 
-bool HasGDocFileExtension(const base::FilePath& file_path) {
-  std::string extension = base::FilePath(file_path.Extension()).AsUTF8Unsafe();
-  return IsHostedDocumentByExtension(extension);
-}
-
 GURL ReadUrlFromGDocFile(const base::FilePath& file_path) {
   return GURL(ReadStringFromGDocFile(file_path, "url"));
 }