Remove 'String::append' from some of the blink source.

Source/modules/websockets/WebSocketHandshake.cpp

Index: Source/modules/websockets/WebSocketHandshake.cpp
diff --git a/Source/modules/websockets/WebSocketHandshake.cpp b/Source/modules/websockets/WebSocketHandshake.cpp
old mode 100644
new mode 100755
index b0ed328eb15260c46a096eeea958649db3264814..aa53cd75402f62129b067bbc34020d70675da582
--- a/Source/modules/websockets/WebSocketHandshake.cpp
+++ b/Source/modules/websockets/WebSocketHandshake.cpp
@@ -106,7 +106,7 @@ static String trimInputSample(const char* p, size_t len)
 {
     String s = String(p, std::min<size_t>(len, maxInputSampleSize));
     if (len > maxInputSampleSize)
-        s.append(horizontalEllipsis);
+        s = String(p, std::min<size_t>(len, maxInputSampleSize)) + horizontalEllipsis;
     return s;
 }