Fix Linux GN build after crrev.com/273992

Looks like before this change went in webkit/common/BUILD.gn was landed
and thus when crrev.com/273992 landed they conflicted.

This patch removes the resource_devtools_info.* entries from
webkit/common/BUILD.gn, since now they were moved into
content/content_common.gypi.

BUG=338338
TEST=gn gen out/Release_gn --args='is_debug=false' && ninja -C
out/Release_gn webkit/common
TBR=pilgrim@chromium.org,jam@chromium.org

Review URL: https://codereview.chromium.org/303123011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273994 0039d316-1c4b-4281-b951-d872f2087c98

webkit/common/BUILD.gn

@@ -8,8 +8,6 @@ component("common") {
   sources = [
     "data_element.cc",
     "data_element.h",
-    "resource_devtools_info.cc",
-    "resource_devtools_info.h",
     "resource_type.cc",
     "resource_type.h",
     "webkit_common_export.h",