string_bytes: don't use named imports in header

It imports the definition into every source file that includes
string_bytes.h, as evidenced by the build suddenly breaking left
and right because of missing Handle/Local/String/Value imports.

src/string_bytes.h

@@ -29,25 +29,20 @@
 
 namespace node {
 
-using v8::Handle;
-using v8::Local;
-using v8::String;
-using v8::Value;
-
 class StringBytes {
  public:
   // Does the string match the encoding? Quick but non-exhaustive.
   // Example: a HEX string must have a length that's a multiple of two.
   // FIXME(bnoordhuis) IsMaybeValidString()? Naming things is hard...
-  static bool IsValidString(Handle<String> string, enum encoding enc);
+  static bool IsValidString(v8::Handle<v8::String> string, enum encoding enc);
 
   // Fast, but can be 2 bytes oversized for Base64, and
   // as much as triple UTF-8 strings <= 65536 chars in length
-  static size_t StorageSize(Handle<Value> val, enum encoding enc);
+  static size_t StorageSize(v8::Handle<v8::Value> val, enum encoding enc);
 
   // Precise byte count, but slightly slower for Base64 and
   // very much slower for UTF-8
-  static size_t Size(Handle<Value> val, enum encoding enc);
+  static size_t Size(v8::Handle<v8::Value> val, enum encoding enc);
 
   // Write the bytes from the string or buffer into the char*
   // returns the number of bytes written, which will always be
@@ -55,14 +50,14 @@ class StringBytes {
   // memory to allocate.
   static size_t Write(char* buf,
                       size_t buflen,
-                      Handle<Value> val,
+                      v8::Handle<v8::Value> val,
                       enum encoding enc,
                       int* chars_written = NULL);
 
   // Take the bytes in the src, and turn it into a Buffer or String.
-  static Local<Value> Encode(const char* buf,
-                             size_t buflen,
-                             enum encoding encoding);
+  static v8::Local<v8::Value> Encode(const char* buf,
+                                     size_t buflen,
+                                     enum encoding encoding);
 };
 
 }  // namespace node