Fix more windows build warnings.

src/api.cc

 // Copyright 2012 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 4925 matching lines @@
 
 Local<String> v8::String::NewExternal(ExternalLatin1StringResource* resource,
                                       int encoding) {
   typedef v8::internal::Internals I;
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::NewExternal()");
   LOG_API(isolate, "String::NewExternal");
   ENTER_V8(isolate);
   ASSERT((encoding & kStringEncodingMask) == LATIN1_ENCODING);
   CHECK(resource && resource->data());
-  bool ascii_hint = (encoding & kAsciiHintMask);
+  int ascii_hint = (encoding & kAsciiHintMask);
   i::Handle<i::String> result;
 
   if (ascii_hint == ASCII_HINT ||
       (ascii_hint != NOT_ASCII_HINT &&
-      i::String::IsAscii(resource->data(), resource->length()))) {
+       i::String::IsAscii(resource->data(),
+                          static_cast<int>(resource->length())))) {
     // Assert that the ascii hint is correct.
     ASSERT(ascii_hint != ASCII_HINT ||
-           i::String::IsAscii(resource->data(), resource->length()));
+           i::String::IsAscii(resource->data(),
+                              static_cast<int>(resource->length())));
     result = NewExternalAsciiStringHandle(isolate, resource);
     isolate->heap()->external_string_table()->AddString(*result);
   } else {
     // We cannot simply take the backing store and use it as an ASCII string,
     // since it's not.  Instead, we convert it to an internal string and dispose
     // the external resource.
     result = isolate->factory()->NewStringFromLatin1(
-        i::Vector<const char>(resource->data(), resource->length()),
+        i::Vector<const char>(resource->data(),
+                              static_cast<int>(resource->length())),
         i::NOT_TENURED,
         i::String::NOT_ASCII);
     resource->Dispose();
   }
   return Utils::ToLocal(result);
 }
 
 
 bool v8::String::CanMakeExternal() {
   if (!internal::FLAG_clever_optimizations) return false;
@@ skipping 1678 matching lines @@
 
   v->VisitPointers(blocks_.first(), first_block_limit_);
 
   for (int i = 1; i < blocks_.length(); i++) {
     v->VisitPointers(blocks_[i], &blocks_[i][kHandleBlockSize]);
   }
 }
 
 
 } }  // namespace v8::internal