Override minimum logging level for breakpad to error messages.

Otherwise, minidump_stackwalk produces far more debug output than
actual output.

BUG=none
R=mark@chromium.org

Review URL: https://codereview.chromium.org/59163005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233242 0039d316-1c4b-4281-b951-d872f2087c98

breakpad/breakpad.gyp

@@ -16,6 +16,7 @@
           'target_name': 'minidump_stackwalk',
           'type': 'executable',
           'includes': ['breakpad_tools.gypi'],
+          'defines': ['BPLOG_MINIMUM_SEVERITY=SEVERITY_ERROR'],
           'sources': [
             'src/processor/basic_code_module.h',
             'src/processor/basic_code_modules.cc',