[fuchsia] Fix BUILD.gn for absl/strings

Add mising includes and internal cc files.

Change-Id: I1e691bc08af960413e1d9a52797a79d9f0190b9a
diff --git a/absl/strings/BUILD.gn b/absl/strings/BUILD.gn
index 5712451..a3d8595 100644
--- a/absl/strings/BUILD.gn
+++ b/absl/strings/BUILD.gn
@@ -21,29 +21,21 @@
     "charconv.h",
     "escaping.cc",
     "escaping.h",
-    "internal/charconv_bigint.cc",
-    "internal/charconv_bigint.h",
-    "internal/charconv_parse.cc",
-    "internal/charconv_parse.h",
-    "internal/memutil.cc",
-    "internal/memutil.h",
-    "internal/stl_type_traits.h",
-    "internal/str_join_internal.h",
-    "internal/str_split_internal.h",
     "match.cc",
     "match.h",
     "numbers.cc",
     "numbers.h",
     "str_cat.cc",
     "str_cat.h",
+    "str_format.h",
+    "string_view.cc",
+    "string_view.h",
+    "strip.h",
     "str_join.h",
     "str_replace.cc",
     "str_replace.h",
     "str_split.cc",
     "str_split.h",
-    "string_view.cc",
-    "string_view.h",
-    "strip.h",
     "substitute.cc",
     "substitute.h",
   ]
@@ -65,11 +57,34 @@
   public_configs = [ "//third_party/abseil-cpp:abseil_config" ]
 
   sources = [
-    "internal/bits.h",
+    "internal/charconv_bigint.cc",
+    "internal/charconv_bigint.h",
+    "internal/charconv_parse.cc",
+    "internal/charconv_parse.h",
     "internal/char_map.h",
+    "internal/memutil.cc",
+    "internal/memutil.h",
     "internal/ostringstream.cc",
     "internal/ostringstream.h",
+    "internal/pow10_helper.cc",
+    "internal/pow10_helper.h",
     "internal/resize_uninitialized.h",
+    "internal/stl_type_traits.h",
+    "internal/str_format/arg.cc",
+    "internal/str_format/arg.h",
+    "internal/str_format/bind.cc",
+    "internal/str_format/bind.h",
+    "internal/str_format/checker.h",
+    "internal/str_format/extension.cc",
+    "internal/str_format/extension.h",
+    "internal/str_format/float_conversion.cc",
+    "internal/str_format/float_conversion.h",
+    "internal/str_format/output.cc",
+    "internal/str_format/output.h",
+    "internal/str_format/parser.cc",
+    "internal/str_format/parser.h",
+    "internal/str_join_internal.h",
+    "internal/str_split_internal.h",
     "internal/utf8.cc",
     "internal/utf8.h",
   ]