lint: fix quoting style everywhere

BUG=chromium:990019
TEST=`cros lint` is clean & CQ passes

Change-Id: I012966d34a45a01b3a940414b24316aee4ffe8af
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/1731476
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Will Bradley <wbbradley@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/upload_symbols.py b/scripts/upload_symbols.py
index f577132..48a0507 100644
--- a/scripts/upload_symbols.py
+++ b/scripts/upload_symbols.py
@@ -399,13 +399,13 @@
 
 
 def UploadSymbolFile(upload_url, symbol, api_key):
-  '''Upload a symbol file to the crash server, returning the status result.
+  """Upload a symbol file to the crash server, returning the status result.
 
   Args:
     upload_url: The crash URL to POST the |sym_file| to
     symbol: A SymbolFile instance.
     api_key: Authentication key
-  '''
+  """
   timeout = GetUploadTimeout(symbol)
   upload = ExecRequest('post',
                        '%s/uploads:create' % upload_url, timeout, api_key)