[Cronet] Explicitly set ios_deployment_target = "9.0" in Cronet builds.

Bug: 775564
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ia042509d3686d501f2b459c1fe03956422b5af4a
Reviewed-on: https://chromium-review.googlesource.com/760487
Commit-Queue: Misha Efimov <mef@chromium.org>
Reviewed-by: smut <smut@google.com>
Cr-Commit-Position: refs/heads/master@{#515422}

components/cronet/tools/cr_cronet.py

@@ -80,7 +80,7 @@ def main():
     target_os = 'ios'
     test_target = 'cronet_test'
     gn_args = 'is_cronet_build=true is_component_build=false ' \
-        'use_xcode_clang=true '
+        'use_xcode_clang=true ios_deployment_target="9.0" '
     gn_extra = '--ide=xcode'
     if options.iphoneos:
       gn_args += ' target_cpu="arm64" '

components/cronet/tools/package_ios.py

@@ -100,6 +100,7 @@ def package_ios_framework_using_gn(out_dir='out/Framework', extra_options=''):
                 'is_cronet_build=true is_component_build=false ' \
                 'disable_file_support=true disable_ftp_support=true ' \
                 'include_transport_security_state_preload_list=false ' \
+                'ios_deployment_target="9.0" ' \
                 'use_platform_icu_alternatives=true ' \
                 'disable_brotli_filter=false enable_dsyms=true ' \
                 'target_cpu="%s" additional_target_cpus = ["%s"] %s' % \

ios/build/bots/chromium.fyi/ios-simulator-cronet.json

@@ -12,6 +12,7 @@
     "enable_websockets=false",
     "goma_dir=\"$(goma_dir)\"",
     "include_transport_security_state_preload_list=false",
+    "ios_deployment_target=\"9.0\"",
     "is_component_build=false",
     "is_cronet_build=true",
     "is_debug=true",

ios/build/bots/chromium.mac/ios-simulator-cronet.json

@@ -10,6 +10,7 @@
     "disable_ftp_support=true",
     "enable_websockets=false",
     "goma_dir=\"$(goma_dir)\"",
+    "ios_deployment_target=\"9.0\"",
     "is_component_build=false",
     "is_cronet_build=true",
     "is_debug=true",