Fix common_windows.gyp.

- Rename two files from '.cpp' to '.cc' and insert missing comma in
  between lines in source files list.

Change-Id: I169a738b565f52292cb0292b34c4397e9dc05370
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/1666351
Reviewed-by: Ivan Penkov <ivanpe@chromium.org>
diff --git a/src/common/windows/common_windows.gyp b/src/common/windows/common_windows.gyp
index 095ab9e..5f7594b 100644
--- a/src/common/windows/common_windows.gyp
+++ b/src/common/windows/common_windows.gyp
@@ -77,7 +77,7 @@
         'guid_string.h',
         'http_upload.cc',
         'http_upload.h',
-        'module_info.h'
+        'module_info.h',
         'omap.cc',
         'omap.h',
         'omap_internal.h',
diff --git a/src/common/windows/pe_source_line_writer.cpp b/src/common/windows/pe_source_line_writer.cc
similarity index 100%
rename from src/common/windows/pe_source_line_writer.cpp
rename to src/common/windows/pe_source_line_writer.cc
diff --git a/src/common/windows/pe_util.cpp b/src/common/windows/pe_util.cc
similarity index 100%
rename from src/common/windows/pe_util.cpp
rename to src/common/windows/pe_util.cc