Move StringPiece into the base namespace. It is colliding

net/http/http_util.cc

Index: net/http/http_util.cc
diff --git a/net/http/http_util.cc b/net/http/http_util.cc
index 4381117576cc82daa8769ff2cc365580808b7986..41aa554affb447c7948bd314ccf426a5abe010d2 100644
--- a/net/http/http_util.cc
+++ b/net/http/http_util.cc
@@ -500,8 +500,8 @@ static bool IsLineSegmentContinuable(const char* begin, const char* end) {
 
 // Helper used by AssembleRawHeaders, to find the end of the status line.
 static const char* FindStatusLineEnd(const char* begin, const char* end) {
-  size_t i = StringPiece(begin, end - begin).find_first_of("\r\n");
-  if (i == StringPiece::npos)
+  size_t i = base::StringPiece(begin, end - begin).find_first_of("\r\n");
+  if (i == base::StringPiece::npos)
     return end;
   return begin + i;
 }