a6cba35ff79643c658df2a37937d0450525b5aa7  [Safer CPP] Address uncounted argument warnings in WebCore/Modules

Classified as not security-relevant.
Triage note: Across ~22 Modules files it replaces releaseReturnValue()->x with protect(returnValue())->x and bare obj->method() with protect(obj)->method() (e.g. document->eventLoop()); SaferCPP lifetime hardening with no identified bug.
This commit was flagged by the signal scorer and reviewed by AI (not a human). It is listed only so the triage is auditable; there is no root-cause analysis because this is not a vulnerability fix.

Structural signals: smartptr_member_added (+6.47), null_guard (+2.59), uaf_lifetime (+4.75), clamp_saturate (+3.88), msg_noise (-2.5), area:Source/WebCore/Modules/mediastream (+2.0), large_churn (-2.0)