[base] Remove base::StringPiece::as_string() usages

Bug: 1049498
Change-Id: Ia6fc9f76b45e755fbe67171e6c3513c95932c00f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601364
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Owners-Override: Peter Kasting <pkasting@chromium.org>
Owners-Override: Gabriel Charette <gab@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#877499}
NOKEYCHECK=True
GitOrigin-RevId: 846e1896b78c3f649eba31dab067103625d6db02
diff --git a/google/zip_reader_unittest.cc b/google/zip_reader_unittest.cc
index bba4365..44134f8 100644
--- a/google/zip_reader_unittest.cc
+++ b/google/zip_reader_unittest.cc
@@ -20,6 +20,7 @@
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/stl_util.h"
+#include "base/strings/string_piece.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/task_environment.h"
@@ -510,12 +511,12 @@
     if (i > 0) {
       // Exact byte read limit: must pass.
       EXPECT_TRUE(reader.ExtractCurrentEntryToString(i, &contents));
-      EXPECT_EQ(base::StringPiece("0123456", i).as_string(), contents);
+      EXPECT_EQ(std::string(base::StringPiece("0123456", i)), contents);
     }
 
     // More than necessary byte read limit: must pass.
     EXPECT_TRUE(reader.ExtractCurrentEntryToString(16, &contents));
-    EXPECT_EQ(base::StringPiece("0123456", i).as_string(), contents);
+    EXPECT_EQ(std::string(base::StringPiece("0123456", i)), contents);
   }
   reader.Close();
 }