[ios] Change path to libXCTestBundleInject.dylib

Bug: 1107597
Change-Id: I918049483adbe8a8ad673bf6e2e19c0ea9d27f1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333142Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Lindsay Pasricha <lindsayw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794272}

ios/build/bots/scripts/test_apps.py

@@ -429,8 +429,7 @@ class DeviceXCTestUnitTestsApp(GTestsApp):
             'TestHostPath': '%s' % self.test_app_path,
             'TestingEnvironmentVariables': {
                 'DYLD_INSERT_LIBRARIES':
-                    '__PLATFORMS__/iPhoneOS.platform/Developer/usr/lib/'
-                    'libXCTestBundleInject.dylib',
+                    '__TESTHOST__/Frameworks/libXCTestBundleInject.dylib',
                 'DYLD_LIBRARY_PATH':
                     '__PLATFORMS__/iPhoneOS.platform/Developer/Library',
                 'DYLD_FRAMEWORK_PATH':