Implement File constructor.

LayoutTests/fast/files/script-tests/blob-constructor.js

 description("Test the Blob constructor.");
 
 // Test the diffrent ways you can construct a Blob.
 shouldBeTrue("(new Blob()) instanceof window.Blob");
 shouldBeTrue("(new Blob([])) instanceof window.Blob");
 shouldBeTrue("(new Blob(['hello'])) instanceof window.Blob");
 shouldBeTrue("(new Blob(['hello'], {})) instanceof window.Blob");
 shouldBeTrue("(new Blob(['hello'], {type:'text/html'})) instanceof window.Blob");
 shouldBeTrue("(new Blob(['hello'], {type:'text/html', endings:'native'})) instanceof window.Blob");
 shouldBeTrue("(new Blob(['hello'], {type:'text/html', endings:'transparent'})) instanceof window.Blob");
 
 // Test invalid blob parts
 shouldThrow("new Blob('hello')", "'TypeError: First argument of the constructor is not of type Array'");
 shouldThrow("new Blob(0)", "'TypeError: First argument of the constructor is not of type Array'");
 
 // Test valid blob parts.
 shouldBeTrue("(new Blob([])) instanceof window.Blob");
 shouldBeTrue("(new Blob(['stringPrimitive'])) instanceof window.Blob");
 shouldBeTrue("(new Blob([String('stringObject')])) instanceof window.Blob");
 shouldBeTrue("(new Blob([new Blob])) instanceof window.Blob");
 shouldBeTrue("(new Blob([new Blob([new Blob])])) instanceof window.Blob");
 
 // Test some conversions to string in the parts array.
 shouldBe("(new Blob([12])).size", "2");
 shouldBe("(new Blob([[]])).size", "0");         // [].toString() is the empty string
 shouldBe("(new Blob([{}])).size", "15");;       // {}.toString() is the string "[object Object]"
-shouldBe("(new Blob([document])).size", "21");  // document.toString() is the string "[object HTMLDocument]" 
+shouldBe("(new Blob([document])).size", "21");  // document.toString() is the string "[object HTMLDocument]"
 
 var toStringingObj = { toString: function() { return "A string"; } };
 shouldBe("(new Blob([toStringingObj])).size", "8");
 
 var throwingObj = { toString: function() { throw "Error"; } };
 shouldThrow("new Blob([throwingObj])", "'Error'");
 
 // Test some invalid property bags
 shouldBeTrue("(new Blob([], {unknownKey:'value'})) instanceof window.Blob");    // Ignore invalid keys
 shouldThrow("new Blob([], {endings:'illegalValue'})", "'TypeError: The endings property must be either \"transparent\" or \"native\"'");
@@ skipping 47 matching lines @@
 shouldBe("new Blob([(new Uint8ClampedArray(100)).buffer]).size", "100");
 shouldBe("new Blob([(new Uint16Array(100)).buffer]).size", "200");
 shouldBe("new Blob([(new Uint32Array(100)).buffer]).size", "400");
 shouldBe("new Blob([(new Int8Array(100)).buffer]).size", "100");
 shouldBe("new Blob([(new Int16Array(100)).buffer]).size", "200");
 shouldBe("new Blob([(new Int32Array(100)).buffer]).size", "400");
 shouldBe("new Blob([(new Float32Array(100)).buffer]).size", "400");
 shouldBe("new Blob([(new Float64Array(100)).buffer]).size", "800");
 shouldBe("new Blob([(new Float64Array(100)).buffer, (new Int32Array(100)).buffer, (new Uint8Array(100)).buffer, (new DataView(new ArrayBuffer(100))).buffer]).size", "1400");
 shouldBe("new Blob([new Blob([(new Int32Array(100)).buffer]), (new Uint8Array(100)).buffer, (new Float32Array(100)).buffer, (new DataView(new ArrayBuffer(100))).buffer]).size", "1000");