Put bit_cast<>() into the base:: namespace.

This helps prevent ambiguous symbol issues in C++20 and should have been
the case anyway.

Bug: 1284275
Change-Id: I86210c7b1c8133e8c872930e9e1fdf86b663e104
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3615258
Auto-Submit: Peter Kasting <[email protected]>
Reviewed-by: Hongchan Choi <[email protected]>
Reviewed-by: Lei Zhang <[email protected]>
Owners-Override: Lei Zhang <[email protected]>
Commit-Queue: Peter Kasting <[email protected]>
Cr-Commit-Position: refs/heads/main@{#998789}
diff --git a/components/segmentation_platform/internal/segmentation_ukm_helper.cc b/components/segmentation_platform/internal/segmentation_ukm_helper.cc
index 9c509f3..66efef7 100644
--- a/components/segmentation_platform/internal/segmentation_ukm_helper.cc
+++ b/components/segmentation_platform/internal/segmentation_ukm_helper.cc
@@ -197,7 +197,7 @@
 // static
 int64_t SegmentationUkmHelper::FloatToInt64(float f) {
   // Encode the float number in IEEE754 double precision.
-  return bit_cast<int64_t>(static_cast<double>(f));
+  return base::bit_cast<int64_t>(static_cast<double>(f));
 }
 
 }  // namespace segmentation_platform