Feature Policy Onion Soup (2)

STEP 2:
- Rename WebFeaturePolicyFeature to FeaturePolicyFeature

See Feature Policy Onion Soup (1) at:
https://chromium-review.googlesource.com/c/chromium/src/+/726343/
See Feature Policy Onion Soup (3) at:
https://chromium-review.googlesource.com/c/chromium/src/+/742601
See Feature Policy Onion Soupe (4) at:
https://chromium-review.googlesource.com/c/chromium/src/+/749783

Bug: 561879
Change-Id: I55c689c1c56a9ca7e43ac101fe9ed33c72138c61
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_dbg_ng;master.tryserver.chromium.linux:linux_site_isolation
Reviewed-on: https://chromium-review.googlesource.com/742421
Commit-Queue: Luna Lu <loonybear@chromium.org>
Reviewed-by: Dimitri Glazkov <dglazkov@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#514471}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: bd7ae2fdffcad95add12407ca671f3e1f4657c9b

check_gn_headers_whitelist.txt

@@ -245,6 +245,7 @@ skia/ext/convolver_mips_dspr2.h
 skia/ext/skia_commit_hash.h
 skia/ext/texture_handle.h
 testing/gmock_mutant.h
+third_party/WebKit/common/feature_policy/feature_policy_feature.h
 third_party/WebKit/Source/bindings/modules/v8/serialization/WebCryptoSubTags.h
 third_party/WebKit/Source/core/animation/CSSInterpolationEnvironment.h
 third_party/WebKit/Source/core/animation/SVGInterpolationEnvironment.h
@@ -267,7 +268,6 @@ third_party/WebKit/Source/platform/scheduler/base/task_queue.h
 third_party/WebKit/Source/platform/text/TabSize.h
 third_party/WebKit/Source/platform/text/TextDirection.h
 third_party/WebKit/Source/platform/transforms/TransformOperation.h
-third_party/WebKit/public/platform/WebFeaturePolicyFeature.h
 third_party/WebKit/public/platform/WebSourceLocation.h
 third_party/WebKit/public/platform/WebTouchInfo.h
 third_party/WebKit/public/platform/modules/media_capabilities/WebMediaCapabilitiesInfo.h