Add libpeerconnection pdb to the symbol archive.

BUG=none
NOTRY=True
R=grt@chromium.org

Review URL: https://codereview.chromium.org/255893003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266356 0039d316-1c4b-4281-b951-d872f2087c98

chrome/tools/build/win/FILES.cfg

@@ -671,6 +671,12 @@ FILES = [
     'buildtype': ['dev', 'official'],
     'archive': 'chrome-win32-syms.zip',
   },
+  {
+    'filename': 'libpeerconnection.dll.pdb',
+    'buildtype': ['dev', 'official'],
+    'archive': 'chrome-win32-syms.zip',
+    'optional': ['dev', 'official'],
+  },
   {
     'filename': 'mini_installer.exe.pdb',
     'buildtype': ['dev', 'official'],