Remove dependency on Vector from platform files

src/log-utils.cc

Index: src/log-utils.cc
diff --git a/src/log-utils.cc b/src/log-utils.cc
index 9f1f8e7f7be818c9dcffe96fe3fd0a75364cef32..4598b81199c2ee3f4a96e18dfd30a1d16b2ba50f 100644
--- a/src/log-utils.cc
+++ b/src/log-utils.cc
@@ -112,7 +112,7 @@ void Log::MessageBuilder::Append(const char* format, ...) {
 void Log::MessageBuilder::AppendVA(const char* format, va_list args) {
   Vector<char> buf(log_->message_buffer_ + pos_,
                    Log::kMessageBufferSize - pos_);
-  int result = v8::internal::OS::VSNPrintF(buf, format, args);
+  int result = v8::internal::VSNPrintF(buf, format, args);
 
   // Result is -1 if output was truncated.
   if (result >= 0) {
@@ -211,7 +211,7 @@ void Log::MessageBuilder::AppendStringPart(const char* str, int len) {
   }
   Vector<char> buf(log_->message_buffer_ + pos_,
                    Log::kMessageBufferSize - pos_);
-  OS::StrNCpy(buf, str, len);
+  StrNCpy(buf, str, len);
   pos_ += len;
   ASSERT(pos_ <= Log::kMessageBufferSize);
 }