Fix 'iOS API Framework Builder'.

When building WebRTC.framework, building the XCTest test runner is a
problem because it requires Chromium's //base checkout. This workaround
allows to skip that.

No-Presubmit: True
Bug: webrtc:12134
Change-Id: I0d99bd03f27911f46679ee91b0120e7121d1c7d7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/196081
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Jeremy Leconte <jleconte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32732}
diff --git a/tools_webrtc/ios/build_ios_libs.py b/tools_webrtc/ios/build_ios_libs.py
index 3833383..1971c3e 100755
--- a/tools_webrtc/ios/build_ios_libs.py
+++ b/tools_webrtc/ios/build_ios_libs.py
@@ -124,7 +124,8 @@
     output_dir = os.path.join(output_dir, target_arch + '_libs')
     gn_args = [
         'target_os="ios"', 'ios_enable_code_signing=false',
-        'use_xcode_clang=true', 'is_component_build=false'
+        'use_xcode_clang=true', 'is_component_build=false',
+        'rtc_include_tests=false',
     ]
 
     # Add flavor option.