Improve comment for ChromeUserProfileReport.name

Bug: none
Change-Id: Iac34093a83534359bcdad650a3475198a9fc576e
Reviewed-on: https://chromium-review.googlesource.com/1050525Reviewed-by: Georges Khalil <georgesak@chromium.org>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557122}

components/policy/proto/device_management_backend.proto

@@ -872,7 +872,8 @@ message ChromeUserProfileReport {
   // The number of safe browsing warning pages the user has clicked through
   // since the last report was successfully uploaded.
   optional uint64 safe_browsing_warnings_click_through = 8;
-  // The name of the loaded profile. Empty when in incognito mode
+  // The name of the loaded profile, which was entered by the user when creating
+  // the profile. Empty when in incognito mode.
   optional string name = 9;
 }