[GLib] Don't initialize GStreamer in the Network process for file loads - #77412

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[GLib] Don't initialize GStreamer in the Network process for file loads
https://bugs.webkit.org/show_bug.cgi?id=327967

Reviewed by NOBODY (OOPS!).

For file:// loads, NetworkDataTaskSoup::didGetFileInfo() chooses between the
MIME type from the file's extension and the one GIO sniffed from its content
with MIMETypeRegistry::canShowMIMEType(). For audio, video and application
types that asks the media engines, which initializes GStreamer and reads its
registry in the Network process: about 4 MB of memory and 10 ms of CPU for
loading a file of an unknown type.

Keep audio and video types from the extension as they are, and check other
types without the media engines, with the new
MIMETypeRegistry::canShowNonMediaMIMEType(). The extension's type is kept
rather than the sniffed one because GIO sniffs Ogg files as subtypes such as
audio/x-opus+ogg and video/x-theora+ogg, which GStreamer doesn't register.

The Network process now release-asserts that it never initializes GStreamer.

* Source/WebCore/platform/MIMETypeRegistry.cpp:
(WebCore::MIMETypeRegistry::canShowMIMEType):
(WebCore::MIMETypeRegistry::canShowNonMediaMIMEType):
* Source/WebCore/platform/MIMETypeRegistry.h:
* Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.cpp:
(WebCore::ensureGStreamerInitializedNonWebProcess):
* Source/WebKit/NetworkProcess/soup/NetworkDataTaskSoup.cpp:
(WebKit::NetworkDataTaskSoup::didGetFileInfo):

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