Fix assertion in the debug agent.

Patch by Chris Taylor <chris@gameclosure.com>.

R=yangguo@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10543018

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11722 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/debug-agent.cc

@@ -399,7 +399,7 @@ bool DebuggerAgentUtil::SendMessage(const Socket* conn,
     uint16_t character = message[i];
     buffer_position +=
         unibrow::Utf8::Encode(buffer + buffer_position, character, previous);
-    ASSERT(buffer_position < kBufferSize);
+    ASSERT(buffer_position <= kBufferSize);
 
     // Send buffer if full or last character is encoded.
     if (kBufferSize - buffer_position <