Fix typo in Byte->MegaByte conversion.

Bug: b:151176984
Change-Id: I21cdb37edcc8880c86660393c7e4ed620e70fe89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2397984Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Daniil Lunev <dlunev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805596}

chrome/browser/metrics/cros_healthd_metrics_provider.cc

@@ -153,7 +153,7 @@ void CrosHealthdMetricsProvider::OnProbeDone(
     }
 
     dev.set_model(storage->name);
-    dev.set_size_mb(storage->size / 1000);
+    dev.set_size_mb(storage->size / 1e6);
 
     devices_.push_back(dev);
   }

chrome/browser/metrics/cros_healthd_metrics_provider_unittest.cc

@@ -26,7 +26,7 @@ constexpr uint32_t kProductId = 17;
 constexpr uint32_t kRevision = 92;
 constexpr uint64_t kFwVersion = 0xA0EF1;
 constexpr uint64_t kSizeMb = 1024;
-constexpr uint64_t kSize = kSizeMb * 1000;
+constexpr uint64_t kSize = kSizeMb * 1e6;
 constexpr char kModel[] = "fabulous";
 constexpr char kSubsystem[] = "block:nvme:pcie";
 constexpr auto kType =