Don't expose Suite objects as this of describe functions

This was a holdover from 1.x that should have been removed in 2.0,
but was missed. Suite is meant to be private, and almost none of
its methods can be safely called by user code.

src/core/Env.js

@@ -987,7 +987,7 @@ getJasmineRequireObj().Env = function(j$) {
 
       var declarationError = null;
       try {
-        specDefinitions.call(j$.deprecatingThisProxy(suite, self));
+        specDefinitions();
       } catch (e) {
         declarationError = e;
       }

src/core/deprecatingThisProxy.js

@@ -1,32 +0,0 @@
-/* eslint-disable compat/compat */
-// TODO: Remove this in the next major release.
-getJasmineRequireObj().deprecatingThisProxy = function(j$) {
-  var msg = "Access to 'this' in describe functions is deprecated.";
-
-  try {
-    new Proxy({}, {});
-  } catch (e) {
-    // Environment does not support Poxy.
-    return function(suite) {
-      return suite;
-    };
-  }
-
-  function DeprecatingThisProxyHandler(env) {
-    this._env = env;
-  }
-
-  DeprecatingThisProxyHandler.prototype.get = function(target, prop, receiver) {
-    this._env.deprecated(msg);
-    return target[prop];
-  };
-
-  DeprecatingThisProxyHandler.prototype.set = function(target, prop, value) {
-    this._env.deprecated(msg);
-    return (target[prop] = value);
-  };
-
-  return function(suite, env) {
-    return new Proxy(suite, new DeprecatingThisProxyHandler(env));
-  };
-};

src/core/requireCore.js

@@ -43,7 +43,6 @@ var getJasmineRequireObj = (function(jasmineGlobal) {
     j$.Clock = jRequire.Clock();
     j$.DelayedFunctionScheduler = jRequire.DelayedFunctionScheduler(j$);
     j$.Env = jRequire.Env(j$);
-    j$.deprecatingThisProxy = jRequire.deprecatingThisProxy(j$);
     j$.StackTrace = jRequire.StackTrace(j$);
     j$.ExceptionFormatter = jRequire.ExceptionFormatter(j$);
     j$.ExpectationFilterChain = jRequire.ExpectationFilterChain();