Remove unnecessary jsoncpp includes.

These are already added in third_party/jsoncpp/BUILD.gn so they
shouldn't be needed.

BUG=webrtc:6412
NOTRY=True
NOTREECHECKS=True

Review-Url: https://codereview.webrtc.org/2368543002
Cr-Commit-Position: refs/heads/master@{#14379}
diff --git a/webrtc/base/BUILD.gn b/webrtc/base/BUILD.gn
index d4c5c0b..ce33132 100644
--- a/webrtc/base/BUILD.gn
+++ b/webrtc/base/BUILD.gn
@@ -22,11 +22,6 @@
 }
 
 config("rtc_base_config") {
-  include_dirs = [
-    "//third_party/jsoncpp/overrides/include",
-    "//third_party/jsoncpp/source/include",
-  ]
-
   defines = [
     "FEATURE_ENABLE_SSL",
     "LOGGING=1",
diff --git a/webrtc/base/base.gyp b/webrtc/base/base.gyp
index f149eb3..350489c 100644
--- a/webrtc/base/base.gyp
+++ b/webrtc/base/base.gyp
@@ -381,10 +381,6 @@
           'HAVE_OPENSSL_SSL_H',
         ],
       },
-      'include_dirs': [
-        '../../third_party/jsoncpp/overrides/include',
-        '../../third_party/jsoncpp/source/include',
-      ],
       'conditions': [
         ['build_with_chromium==1', {
           'include_dirs': [