Move rtc_task_runner dependency from rtc_base to rtc_base_unittests.

webrtc/base/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/crypto.gni")
 import("//build/config/ui.gni")
@@ skipping 353 matching lines @@
 rtc_static_library("rtc_base") {
   cflags = []
   cflags_cc = []
   libs = []
   defines = []
   deps = [
     "..:webrtc_common",
   ]
   public_deps = [
     ":rtc_base_approved",
-    ":rtc_task_runner",
   ]
   public_configs = []
 
   all_dependent_configs = [ ":rtc_base_all_dependent_config" ]
 
   sources = [
     "applefilesystem.mm",
     "asyncinvoker-inl.h",
     "asyncinvoker.cc",
     "asyncinvoker.h",
@@ skipping 498 matching lines @@
     }
     if (is_posix) {
       sources += [
         "ssladapter_unittest.cc",
         "sslidentity_unittest.cc",
         "sslstreamadapter_unittest.cc",
       ]
     }
     deps = [
       ":rtc_base_tests_main",
+      ":rtc_task_runner",
     ]
     public_deps = [
       ":rtc_base",
     ]
     configs += [ ":rtc_base_unittests_config" ]
     if (!build_with_chromium && is_clang) {
       # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
 }
 
 if (is_android) {
   android_library("base_java") {
     java_files = [
       "java/src/org/webrtc/Logging.java",
       "java/src/org/webrtc/Size.java",
       "java/src/org/webrtc/ThreadUtils.java",
     ]
   }
 }