protoc_wrapper: Fix typo in exception class name

This CL fixes this script to use a correct exception class
(RuntimeError) instead of non-existing RuntimeException one.

Bug: none
Change-Id: I221f66ac7eac4af46f53f7137840fbf62445e4d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2426567
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Auto-Submit: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#810031}

tools/protoc_wrapper/protoc_wrapper.py

@@ -53,7 +53,7 @@ def WriteIncludes(headers, include):
         contents.append(stripped_line)
         if stripped_line == PROTOC_INCLUDE_POINT:
           if include_point_found:
-            raise RuntimeException("Multiple include points found.")
+            raise RuntimeError("Multiple include points found.")
           include_point_found = True
           extra_statement = "#include \"{0}\"".format(include)
           contents.append(extra_statement)