Actually enable -Wimplicit-fallthrough for pdfium.

I forgot to do this in https://pdfium-review.googlesource.com/c/pdfium/+/26210
which made PDFium compile with the warning enabled.

Bug: 807632
Change-Id: Id12e3df3073f3b9550d5bc9dfea0068088496f8a
Reviewed-on: https://pdfium-review.googlesource.com/26910
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>

1 files changed, 0 insertions, 4 deletions

diff --git a/BUILD.gn b/BUILD.gn
index bdadebd400..fd18f13953 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -71,10 +71,6 @@ config("pdfium_common_config") {
     # Assume UTF-8 by default to avoid code page dependencies.
     cflags += [ "/utf-8" ]
   }
-  if (is_clang) {
-    # TODO(thakis): Consider enabling this, https://crbug.com/807632
-    cflags += [ "-Wno-implicit-fallthrough" ]
-  }
 }
 
 config("pdfium_core_config") {