Fix "unsafe narrowing" warnings in absl, 1/n.

Addresses failures with the following, in some files:
-Wshorten-64-to-32
-Wimplicit-int-conversion
-Wsign-compare
-Wsign-conversion
-Wtautological-unsigned-zero-compare

(This specific CL focuses on .h and win32 .inc files.)

Bug: chromium:1292951
PiperOrigin-RevId: 463835431
Change-Id: If8e5f7f651d5cd96035e23e4623bdb08a7fedabe

1 files changed, 2 insertions, 3 deletions

diff --git a/absl/strings/cord_buffer.h b/absl/strings/cord_buffer.h
index 56a6ce6f..09a74ad5 100644
--- a/absl/strings/cord_buffer.h
+++ b/absl/strings/cord_buffer.h
@@ -330,8 +330,7 @@ class CordBuffer {
 
     // Returns the available area of the internal SSO data
     absl::Span<char> short_available() {
-      assert(is_short());
-      const size_t length = (short_rep.raw_size >> 1);
+      const size_t length = short_length();
       return absl::Span<char>(short_rep.data + length,
                               kInlineCapacity - length);
     }
@@ -347,7 +346,7 @@ class CordBuffer {
     // Returns the length of the internal SSO data.
     size_t short_length() const {
       assert(is_short());
-      return short_rep.raw_size >> 1;
+      return static_cast<size_t>(short_rep.raw_size >> 1);
     }
 
     // Sets the length of the internal SSO data.