crypto: Use stl utilities from the base namespace

crypto/sha2.cc

Index: crypto/sha2.cc
diff --git a/crypto/sha2.cc b/crypto/sha2.cc
index e97b8f40376b5d34c4581bd6949380bec2b96251..1b302b34f6a950dda918f5cc69379c0e287c9f9a 100644
--- a/crypto/sha2.cc
+++ b/crypto/sha2.cc
@@ -21,7 +21,7 @@ void SHA256HashString(const base::StringPiece& str, void* output, size_t len) {
 
 std::string SHA256HashString(const base::StringPiece& str) {
   std::string output(kSHA256Length, 0);
-  SHA256HashString(str, string_as_array(&output), output.size());
+  SHA256HashString(str, base::string_as_array(&output), output.size());
   return output;
 }