Remove Http2String wrapper for std::string.

gfe-relnote: n/a, no functional change.
PiperOrigin-RevId: 263816460
Change-Id: I4f365540414e6a3d78fd00ce6b39a4cdd4c14140
diff --git a/http2/hpack/hpack_string_test.cc b/http2/hpack/hpack_string_test.cc
index 898ef8d..9230ecc 100644
--- a/http2/hpack/hpack_string_test.cc
+++ b/http2/hpack/hpack_string_test.cc
@@ -26,7 +26,7 @@
 class HpackStringTest : public ::testing::Test {
  protected:
   AssertionResult VerifyNotEqual(HpackString* actual,
-                                 const Http2String& not_expected_str) {
+                                 const std::string& not_expected_str) {
     const char* not_expected_ptr = not_expected_str.c_str();
     Http2StringPiece not_expected_sp(not_expected_str);
 
@@ -52,7 +52,7 @@
   }
 
   AssertionResult VerifyEqual(HpackString* actual,
-                              const Http2String& expected_str) {
+                              const std::string& expected_str) {
     VERIFY_EQ(actual->size(), expected_str.size());
 
     const char* expected_ptr = expected_str.c_str();
@@ -103,12 +103,12 @@
 }
 
 TEST_F(HpackStringTest, MoveStringConstructor) {
-  Http2String str0(kStr0);
+  std::string str0(kStr0);
   HpackString hs0(str0);
   EXPECT_TRUE(VerifyEqual(&hs0, kStr0));
   EXPECT_TRUE(VerifyNotEqual(&hs0, kStr1));
 
-  Http2String str1(kStr1);
+  std::string str1(kStr1);
   HpackString hs1(str1);
   EXPECT_TRUE(VerifyEqual(&hs1, kStr1));
   EXPECT_TRUE(VerifyNotEqual(&hs1, kStr0));