Implement File constructor.

LayoutTests/fast/files/blob-constructor-expected.txt

Index: LayoutTests/fast/files/blob-constructor-expected.txt
diff --git a/LayoutTests/fast/files/blob-constructor-expected.txt b/LayoutTests/fast/files/blob-constructor-expected.txt
index 35e7b054670a317333e01de67632b24cf5690267..8d65661f64dae518a917c61af988a7272aa30f65 100644
--- a/LayoutTests/fast/files/blob-constructor-expected.txt
+++ b/LayoutTests/fast/files/blob-constructor-expected.txt
@@ -24,13 +24,13 @@ PASS (new Blob([document])).size is 21
 PASS (new Blob([toStringingObj])).size is 8
 PASS new Blob([throwingObj]) threw exception Error.
 PASS (new Blob([], {unknownKey:'value'})) instanceof window.Blob is true
-PASS new Blob([], {endings:'illegalValue'}) threw exception TypeError: Failed to construct 'Blob': The 2nd argument's "endings" property must be either "transparent" or "native"..
+PASS new Blob([], {endings:'illegalValue'}) threw exception TypeError: Failed to construct 'Blob': The "endings" property must be either "transparent" or "native"..
 PASS new Blob([], {endings:throwingObj}) threw exception Error.
 PASS new Blob([], {type:throwingObj}) threw exception Error.
-PASS new Blob([], {type:'helloî'}) threw exception SyntaxError: Failed to construct 'Blob': The 2nd argument's "type" property must consist of ASCII characters..
+PASS new Blob([], {type:'helloî'}) threw exception SyntaxError: Failed to construct 'Blob': The "type" property must consist of ASCII characters..
 PASS new Blob([], {endings:throwingObj1, type:throwingObj2}) threw exception Error 1.
 PASS new Blob([], {type:throwingObj2, endings:throwingObj1}) threw exception Error 1.
-PASS new Blob([], {type:throwingObj2, endings:'illegal'}) threw exception TypeError: Failed to construct 'Blob': The 2nd argument's "endings" property must be either "transparent" or "native"..
+PASS new Blob([], {type:throwingObj2, endings:'illegal'}) threw exception TypeError: Failed to construct 'Blob': The "endings" property must be either "transparent" or "native"..
 PASS (new Blob([], null)) instanceof window.Blob threw exception TypeError: Failed to construct 'Blob': The 2nd argument is not of type Object..
 PASS (new Blob([], undefined)) instanceof window.Blob threw exception TypeError: Failed to construct 'Blob': The 2nd argument is not of type Object..
 PASS (new Blob([], 123)) instanceof window.Blob threw exception TypeError: Failed to construct 'Blob': The 2nd argument is not of type Object..
@@ -43,7 +43,7 @@ PASS (new Blob([], function () {})) instanceof window.Blob is true
 PASS (new Blob([], {type:'text/html'})).type is 'text/html'
 PASS (new Blob([], {type:'text/html'})).size is 0
 PASS (new Blob([], {type:'text/plain;charset=UTF-8'})).type is 'text/plain;charset=utf-8'
-FAIL window.Blob.length should be 2. Was 0.
+PASS window.Blob.length is 0
 PASS new Blob([new DataView(new ArrayBuffer(100))]).size is 100
 PASS new Blob([new Uint8Array(100)]).size is 100
 PASS new Blob([new Uint8ClampedArray(100)]).size is 100
@@ -73,7 +73,7 @@ PASS new Blob({length: 0}).size is 0
 PASS new Blob({length: 1, 0: 'string'}).size is 6
 PASS new Blob({length: 2, 0: new Uint8Array(100), 1: new Int16Array(100)}).size is 300
 PASS new Blob({length: 1, 0: 'string'}, {type: 'text/html'}).type is 'text/html'
-PASS new Blob({length: 0}, {endings:'illegal'}) threw exception TypeError: Failed to construct 'Blob': The 2nd argument's "endings" property must be either "transparent" or "native"..
+PASS new Blob({length: 0}, {endings:'illegal'}) threw exception TypeError: Failed to construct 'Blob': The "endings" property must be either "transparent" or "native"..
 PASS new Blob(throwingSequence) threw exception Error: Misbehaving property.
 PASS successfullyParsed is true