Android orderfile: update gn target.

The target for the native library has changed from monochrome to
libmonochrome.

Bug: 974763
Change-Id: I2fc7e81479b2ce592f09e5eb5b5e7bb897aff859
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1662449Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Commit-Queue: Matthew Cary (CET) <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#669644}

tools/cygprofile/orderfile_generator_backend.py

@@ -257,7 +257,7 @@ class ClankCompiler(object):
       self._apk = 'Monochrome.apk'
       self._apk_target = 'monochrome_apk'
       self._libname = 'libmonochrome'
-      self._libchrome_target = 'monochrome'
+      self._libchrome_target = 'libmonochrome'
     else:
       self._apk = 'Chrome.apk'
       self._apk_target = 'chrome_apk'