[Cronet] Set "use_crash_key_stubs=true" in Cronet builds.

- Removes Cronet dependency on Breakpad.
- Applies to developer environment and public bots.
- Reduces Cronet binary size, especially on iOS.
- Official buildbots will be updated separately.

Bug: 811308
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I24fe9075a731a507ed8861e1f4811d4d463bb80d
Reviewed-on: https://chromium-review.googlesource.com/964596
Commit-Queue: Misha Efimov <mef@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544211}

components/cronet/tools/cr_cronet.py

@@ -133,6 +133,7 @@ def main():
       'use_platform_icu_alternatives=true '+ \
       'enable_reporting=false '+ \
       'is_component_build=false ' + \
+      'use_crash_key_stubs=true ' + \
       'ignore_elf32_limitations=true use_partition_alloc=false ' + \
       'include_transport_security_state_preload_list=false '
 

components/cronet/tools/package_ios.py

@@ -98,6 +98,7 @@ def package_ios_framework_using_gn(out_dir='out/Framework', extra_options=''):
       build_dir = os.path.join("out", target_dir)
       gn_args = 'target_os="ios" enable_websockets=false ' \
                 'is_cronet_build=true is_component_build=false ' \
+                'use_crash_key_stubs=true ' \
                 'disable_file_support=true disable_ftp_support=true ' \
                 'include_transport_security_state_preload_list=false ' \
                 'ios_deployment_target="9.0" ' \

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

@@ -14,6 +14,7 @@
     "include_transport_security_state_preload_list=false",
     "ios_deployment_target=\"9.0\"",
     "is_component_build=false",
+    "use_crash_key_stubs=true",
     "is_cronet_build=true",
     "is_debug=true",
     "target_cpu=\"x64\"",

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

@@ -17,6 +17,7 @@
     "goma_dir=\"$(goma_dir)\"",
     "ios_deployment_target=\"9.0\"",
     "is_component_build=false",
+    "use_crash_key_stubs=true",
     "is_cronet_build=true",
     "is_debug=true",
     "target_cpu=\"x64\"",

tools/mb/mb_config.pyl

@@ -1881,6 +1881,7 @@
                   'enable_websockets=false use_platform_icu_alternatives=true '
                   'use_partition_alloc=false enable_reporting=false '
                   'include_transport_security_state_preload_list=false '
+                  'use_crash_key_stubs=true '
                   'clang_use_default_sample_profile=false'),
     },