Remove the console polyfills

All browsers that we intend to support with PDF.js version 2.0 already supports `console` natively.

src/display/api.js

@@ -1363,13 +1363,6 @@ var PDFWorker = (function PDFWorkerClosure() {
             }
           });
 
-          messageHandler.on('console_log', function (data) {
-            console.log.apply(console, data);
-          });
-          messageHandler.on('console_error', function (data) {
-            console.error.apply(console, data);
-          });
-
           messageHandler.on('ready', (data) => {
             worker.removeEventListener('error', onWorkerError);
             if (this.destroyed) {

src/shared/compatibility.js

@@ -347,87 +347,6 @@ PDFJS.compatibilityChecked = true;
   });
 })();
 
-// Checking if worker has console support. Forwarding all messages to the main
-// thread if console object is absent.
-(function checkWorkerConsoleCompatibility() {
-  if (typeof importScripts === 'undefined' || 'console' in globalScope) {
-    return;
-  }
-
-  var consoleTimer = {};
-
-  var workerConsole = {
-    log: function log() {
-      var args = Array.prototype.slice.call(arguments);
-      globalScope.postMessage({
-        targetName: 'main',
-        action: 'console_log',
-        data: args,
-      });
-    },
-
-    error: function error() {
-      var args = Array.prototype.slice.call(arguments);
-      globalScope.postMessage({
-        targetName: 'main',
-        action: 'console_error',
-        data: args,
-      });
-    },
-
-    time: function time(name) {
-      consoleTimer[name] = Date.now();
-    },
-
-    timeEnd: function timeEnd(name) {
-      var time = consoleTimer[name];
-      if (!time) {
-        throw new Error('Unknown timer name ' + name);
-      }
-      this.log('Timer:', name, Date.now() - time);
-    },
-  };
-
-  globalScope.console = workerConsole;
-})();
-
-// Check console compatibility
-// In older IE versions the console object is not available
-// unless console is open.
-// Support: IE<10
-(function checkConsoleCompatibility() {
-  if (!hasDOM) {
-    return;
-  }
-  if (!('console' in window)) {
-    window.console = {
-      log() {},
-      error() {},
-      warn() {},
-    };
-    return;
-  }
-  if (!('bind' in console.log)) {
-    // native functions in IE9 might not have bind
-    console.log = (function(fn) {
-      return function(msg) {
-        return fn(msg);
-      };
-    })(console.log);
-    console.error = (function(fn) {
-      return function(msg) {
-        return fn(msg);
-      };
-    })(console.error);
-    console.warn = (function(fn) {
-      return function(msg) {
-        return fn(msg);
-      };
-    })(console.warn);
-    return;
-  }
-})();
-
 // Check onclick compatibility in Opera
 // Support: Opera<15
 (function checkOnClickCompatibility() {