build: update to latest MDC canary and fix errors

Updates to the latest canary version of MDC and fixes the following errors:
- The chip foundation was expanded to include some events for editable chips. These are noops for now since we don't support editable chips yet.
- Some new files were added to the table that we hadn't accounted for.

Author: crisbeto

package.json

@@ -59,7 +59,7 @@
     "@types/youtube": "^0.0.38",
     "@webcomponents/custom-elements": "^1.1.0",
     "core-js": "^2.6.9",
-    "material-components-web": "7.0.0-canary.8073a20a9.0",
+    "material-components-web": "7.0.0-canary.7461aad68.0",
     "rxjs": "^6.5.3",
     "systemjs": "0.19.43",
     "tslib": "^2.0.0",

src/material-experimental/mdc-chips/chip.ts

@@ -279,6 +279,9 @@ export class MatChip extends _MatChipMixinBase implements AfterContentInit, Afte
           // Make it `display: none` so users can't tab into it.
           this._elementRef.nativeElement.style.display = 'none';
         },
+    // Noop for now since we don't support editable chips yet.
+    notifyEditStart: () => {},
+    notifyEditFinish: () => {},
     getComputedStyleValue:
         propertyName => {
           // This function is run when a chip is removed so it might be

src/material-experimental/mdc-helpers/BUILD.bazel

@@ -58,6 +58,8 @@ sass_library(
         "@npm//:node_modules/@material/circular-progress/_mixins.scss",
         "@npm//:node_modules/@material/circular-progress/_variables.import.scss",
         "@npm//:node_modules/@material/circular-progress/_variables.scss",
+        "@npm//:node_modules/@material/data-table/_data-table.scss",
+        "@npm//:node_modules/@material/data-table/_data-table-theme.scss",
         "@npm//:node_modules/@material/data-table/_index.scss",
         "@npm//:node_modules/@material/data-table/_mixins.import.scss",
         "@npm//:node_modules/@material/data-table/_mixins.scss",