Extensions: Consolidate extension id hashing / searching.

components/crx_file/id_util.cc

Index: components/crx_file/id_util.cc
diff --git a/components/crx_file/id_util.cc b/components/crx_file/id_util.cc
index ef271ad1456a2ffa8b2405f87e3aa073a419dbb9..6209cb4a7342b3d4d4fd6af80e54df42ce9e5b16 100644
--- a/components/crx_file/id_util.cc
+++ b/components/crx_file/id_util.cc
@@ -5,6 +5,7 @@
 #include "components/crx_file/id_util.h"
 
 #include "base/files/file_path.h"
+#include "base/sha1.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "crypto/sha2.h"
@@ -53,6 +54,12 @@ std::string GenerateIdForPath(const base::FilePath& path) {
   return GenerateId(path_bytes);
 }
 
+std::string HashedIdInHex(const std::string& id) {
+  const std::string id_hash = base::SHA1HashString(id);
+  DCHECK_EQ(base::kSHA1Length, id_hash.length());
+  return base::HexEncode(id_hash.c_str(), id_hash.length());
+}
+
 base::FilePath MaybeNormalizePath(const base::FilePath& path) {
 #if defined(OS_WIN)
   // Normalize any drive letter to upper-case. We do this for consistency with