Revert of Rename WriteString to WriteStringPiece16 in SpdyFrameBuilder

net/spdy/spdy_frame_builder.cc

Index: net/spdy/spdy_frame_builder.cc
diff --git a/net/spdy/spdy_frame_builder.cc b/net/spdy/spdy_frame_builder.cc
index 1e16abde9b8d8ec29b6e736f7859f1d49e884328..0b852118d11c4519acdd3ffa094755be4bd960b5 100644
--- a/net/spdy/spdy_frame_builder.cc
+++ b/net/spdy/spdy_frame_builder.cc
@@ -130,7 +130,7 @@
   return success;
 }
 
-bool SpdyFrameBuilder::WriteStringPiece16(const base::StringPiece& value) {
+bool SpdyFrameBuilder::WriteString(const std::string& value) {
   if (value.size() > 0xffff) {
     DCHECK(false) << "Tried to write string with length > 16bit.";
     return false;