App Manifest: Fix component in OWNERS files.

The OWNERS files for our implementation of the App Manifest spec
reference the Manifest component, which does not exist in Monorail. This
CL replaces it with the valid Blink>AppManifest component.

Change-Id: Idb413ae22e00003c53847b4c924b189c2c46fa37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040385
Auto-Submit: Victor Costan <pwnall@chromium.org>
Commit-Queue: Matt Giuca <mgiuca@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738846}

content/browser/manifest/OWNERS

 file://third_party/blink/renderer/modules/manifest/OWNERS
 
-# COMPONENT: Manifest
+# Component: Blink>AppManifest
 # TEAM: chromium-reviews@chromium.org

third_party/blink/common/manifest/OWNERS

@@ -3,4 +3,4 @@ file://third_party/blink/renderer/modules/manifest/OWNERS
 per-file *_mojom_traits*.*=set noparent
 per-file *_mojom_traits*.*=file://ipc/SECURITY_OWNERS
 
-# COMPONENT: Manifest
+# Component: Blink>AppManifest

third_party/blink/public/common/manifest/OWNERS

@@ -6,4 +6,4 @@ per-file *.typemap=file://ipc/SECURITY_OWNERS
 per-file *_mojom_traits*.*=set noparent
 per-file *_mojom_traits*.*=file://ipc/SECURITY_OWNERS
 
-# COMPONENT: Manifest
+# Component: Blink>AppManifest

third_party/blink/public/mojom/manifest/OWNERS

@@ -3,4 +3,4 @@ file://third_party/blink/renderer/modules/manifest/OWNERS
 per-file *.mojom=set noparent
 per-file *.mojom=file://ipc/SECURITY_OWNERS
 
-# COMPONENT: Manifest
+# Component: Blink>AppManifest

third_party/blink/renderer/modules/manifest/OWNERS

@@ -5,4 +5,4 @@ mlamouri@chromium.org
 per-file *_type_converter*.*=set noparent
 per-file *_type_converter*.*=file://ipc/SECURITY_OWNERS
 
-# COMPONENT: Manifest
+# Component: Blink>AppManifest