Remove unused, unimplemented and no-op methods from MIMETypeRegistry.

Remove unused, unimplemented and no-op methods from MIMETypeRegistry.

The following methods have been removed.

Unimplemented and unused:
MIMETypeRegistry::getExtensionForMIMEType(const String&)
MIMETypeRegistry::getMediaMIMETypesForExtension(const String&)
MIMETypeRegistry::isUnsupportedTextMIMEType(const String&)
MIMETypeRegistry::canShowMIMEType(const String&)
MIMETypeRegistry::getUnsupportedTextMIMETypes()
MIMETypeRegistry::getNormalizedMIMEType(const String&)
defaultMIMEType()

Trivial and unused:
MIMETypeRegistry::getSupportedImageMIMETypes()
MIMETypeRegistry::getSupportedImageResourceMIMETypes()
MIMETypeRegistry::getSupportedImageMIMETypesForEncoding()
MIMETypeRegistry::getSupportedNonImageMIMETypes()
MIMETypeRegistry::getSupportedMediaMIMETypes()

Trivial implementations:
MIMETypeRegistry::getMediaMIMETypeForExtension(const String&)
MIMETypeRegistry::isApplicationPluginMIMEType(const String&)

BUG=268948
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=155631

[jbroman, 2013-08-06 13:56:27]

It looks like we could also get rid of
MIMETypeRegistry::getPreferredExtensionForMIMEType, but that's left out of this
CL because it's not a trivial method right now (it has Chromium-side code to IPC
to the browser process and so on).

I would, however, appreciate your thoughts on whether that should go away as
well since I can't find any existing call sites.

[abarth-chromium, 2013-08-06 18:40:01]

On 2013/08/06 13:56:27, jbroman wrote:
> I would, however, appreciate your thoughts on whether that should go away as
> well since I can't find any existing call sites.

If there aren't any callers, we can rip it out.

[abarth-chromium, 2013-08-06 18:40:47]

lgtm

[commit-bot: I haz the power, 2013-08-06 18:41:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jbroman@chromium.org/21929002/1

[commit-bot: I haz the power, 2013-08-06 21:01:40]

Change committed as 155631