[Extensions] Use base::StringPiece in ErrorUtils

extensions/common/error_utils.h

Index: extensions/common/error_utils.h
diff --git a/extensions/common/error_utils.h b/extensions/common/error_utils.h
index fedbd2887ba510a41caa393149c623fd43f52a09..5f86ee0bd3ae329fc0cd4d71bd7bb6b6ddbde277 100644
--- a/extensions/common/error_utils.h
+++ b/extensions/common/error_utils.h
@@ -8,35 +8,36 @@
 #include <string>
 
 #include "base/strings/string16.h"
+#include "base/strings/string_piece.h"
 
 namespace extensions {
 
 class ErrorUtils {
  public:
   // Creates an error messages from a pattern.
-  static std::string FormatErrorMessage(const std::string& format,
-                                        const std::string& s1);
+  static std::string FormatErrorMessage(base::StringPiece format,
+                                        base::StringPiece s1);
 
-  static std::string FormatErrorMessage(const std::string& format,
-                                        const std::string& s1,
-                                        const std::string& s2);
+  static std::string FormatErrorMessage(base::StringPiece format,
+                                        base::StringPiece s1,
+                                        base::StringPiece s2);
 
-  static std::string FormatErrorMessage(const std::string& format,
-                                        const std::string& s1,
-                                        const std::string& s2,
-                                        const std::string& s3);
+  static std::string FormatErrorMessage(base::StringPiece format,
+                                        base::StringPiece s1,
+                                        base::StringPiece s2,
+                                        base::StringPiece s3);
 
-  static base::string16 FormatErrorMessageUTF16(const std::string& format,
-                                                const std::string& s1);
+  static base::string16 FormatErrorMessageUTF16(base::StringPiece format,
+                                                base::StringPiece s1);
 
-  static base::string16 FormatErrorMessageUTF16(const std::string& format,
-                                                const std::string& s1,
-                                                const std::string& s2);
+  static base::string16 FormatErrorMessageUTF16(base::StringPiece format,
+                                                base::StringPiece s1,
+                                                base::StringPiece s2);
 
-  static base::string16 FormatErrorMessageUTF16(const std::string& format,
-                                                const std::string& s1,
-                                                const std::string& s2,
-                                                const std::string& s3);
+  static base::string16 FormatErrorMessageUTF16(base::StringPiece format,
+                                                base::StringPiece s1,
+                                                base::StringPiece s2,
+                                                base::StringPiece s3);
 };
 
 }  // namespace extensions