[Permissions Policy] Rename 'feature_policy' in file names

This CL renames 'feature_policy' in file names to 'permissions_policy'
with 2 exceptions:

- dom_feature_policy
- feature_policy_violation_report_body

Both files are closely related to V8 bindings. Changing the file name
would require change to class name defined in the file.

Bug: 1123116
Change-Id: I17968f745fa983df30dcf94fe37c6b4b91616f1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2704785
Reviewed-by: Daniel Cheng <[email protected]>
Reviewed-by: Ian Clelland <[email protected]>
Owners-Override: Daniel Cheng <[email protected]>
Commit-Queue: Charlie Hu <[email protected]>
Cr-Commit-Position: refs/heads/master@{#859569}
diff --git a/chrome/browser/media/midi_permission_context.cc b/chrome/browser/media/midi_permission_context.cc
index 937e4a9..3b19741 100644
--- a/chrome/browser/media/midi_permission_context.cc
+++ b/chrome/browser/media/midi_permission_context.cc
@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 #include "chrome/browser/media/midi_permission_context.h"
-#include "third_party/blink/public/mojom/feature_policy/feature_policy.mojom.h"
+#include "third_party/blink/public/mojom/permissions_policy/permissions_policy.mojom.h"
 
 MidiPermissionContext::MidiPermissionContext(
     content::BrowserContext* browser_context)