[Cronet] Use relative path for android_only_jni_onload_and_cronet_exports.lst.

Bug: 1058889
Change-Id: Ie7a3b809c12fcf562332b8723231129fe282c2b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095335
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Misha Efimov <mef@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Auto-Submit: Misha Efimov <mef@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749273}

components/cronet/android/BUILD.gn

@@ -194,8 +194,9 @@ source_set("cronet_static") {
 }
 
 config("hide_all_but_jni_onload_and_cronet") {
-  ldflags = [ "-Wl,--version-script=" + rebase_path(
-                  "//components/cronet/android/android_only_jni_onload_and_cronet_exports.lst") ]
+  ldflags = [ "-Wl,--version-script=" +
+              rebase_path("android_only_jni_onload_and_cronet_exports.lst",
+                          root_out_dir) ]
 }
 
 _cronet_shared_lib_name = "cronet.$chrome_version_full"