Android: Avoid linking with --gc-sections.

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index fd3c0721917596968770bb2fdac3dd4b9263b110..22bda318fef53a22a7eb09d162e763823ea8395b 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -3490,10 +3490,6 @@ test("unit_tests") {
     android_manifest =
         "//chrome/test/android/unit_tests_apk/AndroidManifest.xml"
     enable_multidex = true
-
-    # Some android targets still depend on --gc-sections to link.
-    # TODO: remove --gc-sections for Debug builds (crbug.com/159847).
-    ldflags = [ "-Wl,--gc-sections" ]
   } else {
     sources += [
       # Bookmark export/import are handled via the BookmarkColumns