Add SpdyString alias for std::string in net/spdy.

net/spdy/fuzzing/hpack_fuzz_util.h

Index: net/spdy/fuzzing/hpack_fuzz_util.h
diff --git a/net/spdy/fuzzing/hpack_fuzz_util.h b/net/spdy/fuzzing/hpack_fuzz_util.h
index 9f1a991688fb9479d59b84dad802089e49b02344..163b8b9e067c7ea58b8c58f6c0b5c6d17d87a99b 100644
--- a/net/spdy/fuzzing/hpack_fuzz_util.h
+++ b/net/spdy/fuzzing/hpack_fuzz_util.h
@@ -9,12 +9,12 @@
 #include <stdint.h>
 
 #include <memory>
-#include <string>
 #include <vector>
 
 #include "net/base/net_export.h"
 #include "net/spdy/hpack/hpack_decoder.h"
 #include "net/spdy/hpack/hpack_encoder.h"
+#include "net/spdy/platform/api/spdy_string.h"
 #include "net/spdy/platform/api/spdy_string_piece.h"
 
 namespace net {
@@ -26,8 +26,8 @@ class NET_EXPORT_PRIVATE HpackFuzzUtil {
   struct NET_EXPORT_PRIVATE GeneratorContext {
     GeneratorContext();
     ~GeneratorContext();
-    std::vector<std::string> names;
-    std::vector<std::string> values;
+    std::vector<SpdyString> names;
+    std::vector<SpdyString> values;
   };
 
   // Initializes a GeneratorContext with a random seed and name/value fixtures.
@@ -40,7 +40,7 @@ class NET_EXPORT_PRIVATE HpackFuzzUtil {
   // upper-bounded by |sanity_bound|.
   static size_t SampleExponential(size_t mean, size_t sanity_bound);
 
-  // Holds an input string, and manages an offset into that string.
+  // Holds an input SpdyString, and manages an offset into that SpdyString.
   struct NET_EXPORT_PRIVATE Input {
     Input();  // Initializes |offset| to zero.
     ~Input();
@@ -52,7 +52,7 @@ class NET_EXPORT_PRIVATE HpackFuzzUtil {
       return input.data() + offset;
     }
 
-    std::string input;
+    SpdyString input;
     size_t offset;
   };
 
@@ -62,7 +62,7 @@ class NET_EXPORT_PRIVATE HpackFuzzUtil {
 
   // Returns the serialized header block length prefix for a block of
   // |block_size| bytes.
-  static std::string HeaderBlockPrefix(size_t block_size);
+  static SpdyString HeaderBlockPrefix(size_t block_size);
 
   // A FuzzerContext holds fuzzer input, as well as each of the decoder and
   // encoder stages which fuzzed header blocks are processed through.