Remove unused WebKit/public/web/ imports

Bug: 
Change-Id: I1fffda120fd4ad18437501e55a5ea01bbb3a0086
Reviewed-on: https://chromium-review.googlesource.com/746050
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512767}

components/pdf/renderer/BUILD.gn

@@ -26,7 +26,6 @@ static_library("renderer") {
     "//ppapi/proxy",
     "//ppapi/proxy:ipc",
     "//ppapi/shared_impl",
-    "//third_party/WebKit/public:blink",
     "//third_party/icu",
     "//v8",
   ]

components/pdf/renderer/pepper_pdf_host.cc

@@ -23,10 +23,6 @@
 #include "ppapi/shared_impl/scoped_pp_resource.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_image_data_api.h"
-#include "third_party/WebKit/public/web/WebDocument.h"
-#include "third_party/WebKit/public/web/WebLocalFrame.h"
-#include "third_party/WebKit/public/web/WebPluginContainer.h"
-#include "third_party/WebKit/public/web/WebView.h"
 
 namespace pdf {