[Nearby] Fix duplicate include of share_target.cc

Fixed: 1123395
Change-Id: I2fc3b5965e0e0ac8b1f3774660d2db5ffe672c81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387117Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#803498}

chrome/browser/BUILD.gn

@@ -3426,8 +3426,6 @@ static_library("browser") {
       "nearby_sharing/paired_key_verification_runner.h",
       "nearby_sharing/payload_tracker.cc",
       "nearby_sharing/payload_tracker.h",
-      "nearby_sharing/share_target.cc",
-      "nearby_sharing/share_target.h",
       "nearby_sharing/share_target_discovered_callback.h",
       "nearby_sharing/share_target_info.cc",
       "nearby_sharing/share_target_info.h",