base/json: Get rid of static initializer in JSONReader.

base/json/json_reader.h

Index: base/json/json_reader.h
diff --git a/base/json/json_reader.h b/base/json/json_reader.h
index 39927dee9a1eb9c02bc08802780af06b75d53025..e91da2e5328f2e2a74cee43928cd8bce0bbacc39 100644
--- a/base/json/json_reader.h
+++ b/base/json/json_reader.h
@@ -64,14 +64,19 @@ class BASE_EXPORT JSONReader {
      END_OF_INPUT,
      INVALID_TOKEN,
     };
+
     Token(Type t, const wchar_t* b, int len)
-      : type(t), begin(b), length(len) {}
+        : type(t), begin(b), length(len) {}
 
     // Get the character that's one past the end of this token.
     wchar_t NextChar() {
       return *(begin + length);
     }
 
+    static Token CreateInvalidToken() {
+      return Token(INVALID_TOKEN, 0, 0);
+    }
+
     Type type;
 
     // A pointer into JSONReader::json_pos_ that's the beginning of this token.