Cleanup pdf DEPS files

We shouldn't blanket allow including WebKit or content/public files.

BUG=none
R=dsinclair@chromium.org

Change-Id: I3592f604b33c03984255b1af321db076ebaa17ca
Reviewed-on: https://chromium-review.googlesource.com/974962Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545060}

components/pdf/DEPS

 include_rules = [
-  "+content/public",
+  "+content/public/common",
   "+ipc",
-  "+ppapi",
-  "+third_party/skia/include",
-  "+third_party/WebKit/public",
-  "+ui/base",
   "+ui/gfx",
-  "+ui/strings",
-  "+ui/touch_selection",
 ]

components/pdf/browser/DEPS

+include_rules = [
+  "+content/public/browser",
+  "+ui/touch_selection",
+  "+ui/strings",
+]

components/pdf/renderer/DEPS

 include_rules = [
+  "+content/public/renderer",
   "+components/strings/grit/components_strings.h",
-  "+gin",
   "+mojo/public/cpp/bindings",
+  "+ppapi",
   "+skia/ext",
+  "+third_party/WebKit/public",
   "+ui/accessibility",
-  "+ui/gfx",
+  "+ui/base",
 ]