Harmonize paths to dependent targets.

This CL consistently use:
 * relative paths for WebRTC dependent targets (test_support)
 * absolute paths for shared dependent targets (abseil)
This is a necessary (but insufficient) step to build WebRTC tests
from Chromium tree (rtc_include_tests=true), since test/ doesn't
sit anymore in the top level directory.

We also make sure that target declarations and uses are
consistent in regard to build_with_chromium flag.

Bug: webrtc:9943
Bug: webrtc:9855
Change-Id: I21dea98894df2fd4bfe2fd7ee7b71ba971e0ab5b
Reviewed-on: https://webrtc-review.googlesource.com/c/108720
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Commit-Queue: Yves Gerey <yvesg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25445}
diff --git a/sdk/android/BUILD.gn b/sdk/android/BUILD.gn
index 8a3f8cc..c513a66 100644
--- a/sdk/android/BUILD.gn
+++ b/sdk/android/BUILD.gn
@@ -1386,23 +1386,23 @@
       ":native_api_video",
       ":opensles_audio_device_module",
       ":video_jni",
+      "../../api/audio_codecs:builtin_audio_decoder_factory",
+      "../../api/audio_codecs:builtin_audio_encoder_factory",
+      "../../api/video:video_frame",
+      "../../media:rtc_audio_video",
+      "../../media:rtc_internal_video_codecs",
+      "../../media:rtc_media_base",
+      "../../modules/audio_device:audio_device",
+      "../../modules/audio_device:mock_audio_device",
+      "../../modules/audio_processing:audio_processing",
+      "../../modules/utility:utility",
+      "../../pc:libjingle_peerconnection",
+      "../../rtc_base:checks",
+      "../../rtc_base:rtc_base_approved",
       "../../system_wrappers:system_wrappers",
-      "//api/audio_codecs:builtin_audio_decoder_factory",
-      "//api/audio_codecs:builtin_audio_encoder_factory",
-      "//api/video:video_frame",
-      "//media:rtc_audio_video",
-      "//media:rtc_internal_video_codecs",
-      "//media:rtc_media_base",
-      "//modules/audio_device:audio_device",
-      "//modules/audio_device:mock_audio_device",
-      "//modules/audio_processing:audio_processing",
-      "//modules/utility:utility",
-      "//pc:libjingle_peerconnection",
-      "//rtc_base:checks",
-      "//rtc_base:rtc_base_approved",
-      "//test:fileutils",
-      "//test:test_support",
-      "//testing/gtest",
+      "../../test:fileutils",
+      "../../test:test_support",
+      "../../testing/gtest",
       "//third_party/abseil-cpp/absl/memory",
     ]
   }