fix(icon): remove trustAs calls in favor of implicit trust conditions

[jelbourn]

No description provided.

[jelbourn]

@topherfangio or @EladBezalel take a look?

[EladBezalel]

Referring your message:

The changes for mdIcon with $sce aren't working out due to security change that was made with angular 1.5
this change would mean that for people who want to load svg icons, they have to do one of the following:

• Request icons from the same-origin
• Pre-load icons into the $templateCache
• Add the origins for the icon requests to the $sce whitelist

So this is actually a breaking change, can't we polyfill the 1.5 fix?

[jelbourn]

@EladBezalel this is a breaking change from previous versions. The allowed sources for SVG icons are now more strict, which enforces a stronger security model.

[EladBezalel]

LGTM

[topherfangio]

LGTM 👍