Use qualified paths for grit/extensions_(renderer_)resources.h

The source file changes were done using:

  for f in $(git grep -l '"grit/extensions_resources.h"' -- '*.cc' '*.mm' '*.h'); do
    sed -i -e 's/"grit\/extensions_resources.h"/"extensions\/grit\/extensions_resources.h"/' $f ;
  done
  for f in $(git grep -l '"grit/extensions_renderer_resources.h"' -- '*.cc' '*.mm' '*.h'); do
    sed -i -e 's/"grit\/extensions_renderer_resources.h"/"extensions\/grit\/extensions_renderer_resources.h"/' $f ;
  done

followed by `git cl format` to re-sort headers.
The gn and DEPS changes were lovingly hand-crafted.

BUG=401588

Review-Url: https://codereview.chromium.org/2714603003
Cr-Commit-Position: refs/heads/master@{#452650}
diff --git a/extensions/DEPS b/extensions/DEPS
index 0765359a..f79d2406 100644
--- a/extensions/DEPS
+++ b/extensions/DEPS
@@ -12,9 +12,9 @@
   "+content/public/test",
   "+crypto",
   "-extensions/components",
+  "+extensions/grit/extensions_renderer_resources.h",
+  "+extensions/grit/extensions_resources.h",
   "+extensions/test",
-  "+grit/extensions_renderer_resources.h",
-  "+grit/extensions_resources.h",
   "+mojo/public",
   "+testing",
   "+third_party/skia/include",