[Isolates] Make lint happy.

src/scanner-base.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 352 matching lines @@
     void Complete() {
       scanner_->TerminateLiteral();
       complete_ = true;
     }
 
    private:
     JavaScriptScanner* scanner_;
     bool complete_;
   };
 
-  JavaScriptScanner(ScannerConstants* scanner_constants);
+  explicit JavaScriptScanner(ScannerConstants* scanner_constants);
 
   // Returns the next token.
   Token::Value Next();
 
   // Returns true if there was a line terminator before the peek'ed token.
   bool has_line_terminator_before_next() const {
     return has_line_terminator_before_next_;
   }
 
   // Scans the input as a regular expression pattern, previous
@@ skipping 168 matching lines @@
   // keyword with the current prefix).
   const char* keyword_;
   int counter_;
   Token::Value keyword_token_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_BASE_H_