Remove webarchive tests.

LayoutTests/platform/chromium-win/webarchive/doctype-expected.txt

Index: LayoutTests/platform/chromium-win/webarchive/doctype-expected.txt
diff --git a/LayoutTests/platform/chromium-win/webarchive/doctype-expected.txt b/LayoutTests/platform/chromium-win/webarchive/doctype-expected.txt
deleted file mode 100644
index 147191ae02a96397bdf6d9d8fbbaccfd38127069..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/chromium-win/webarchive/doctype-expected.txt
+++ /dev/null
@@ -1,14 +0,0 @@
-CONSOLE MESSAGE: line 8: Uncaught TypeError: Object [object Object] has no method 'dumpSourceAsWebArchive'
-layer at (0,0) size 800x600
-  RenderView at (0,0) size 800x600
-layer at (0,0) size 800x56
-  RenderBlock {HTML} at (0,0) size 800x56
-    RenderBody {BODY} at (8,8) size 784x40
-      RenderBlock {DIV} at (0,0) size 784x20
-        RenderInline {A} at (0,0) size 685x19 [color=#0000EE]
-          RenderText {#text} at (0,0) size 685x19
-            text run at (0,0) width 685: "Bug 15290: REGRESSION (r14184-r14216): Duplicate DOCTYPE definitions when saving files as webarchives"
-        RenderText {#text} at (0,0) size 0x0
-      RenderBlock {DIV} at (0,20) size 784x20
-        RenderText {#text} at (0,0) size 460x19
-          text run at (0,0) width 460: "This test checks that only one <!DOCTYPE> tag is written to a webarchive."