Remove mail blockquote special case handling.

LayoutTests/editing/pasteboard/4930986-2-expected.txt

Index: LayoutTests/editing/pasteboard/4930986-2-expected.txt
diff --git a/LayoutTests/editing/pasteboard/4930986-2-expected.txt b/LayoutTests/editing/pasteboard/4930986-2-expected.txt
index 8853db16b0705776729941433aa28c2a8eaba359..834b8b9c344560781602f28fb95a798ecf87609e 100644
--- a/LayoutTests/editing/pasteboard/4930986-2-expected.txt
+++ b/LayoutTests/editing/pasteboard/4930986-2-expected.txt
@@ -1,2 +1,16 @@
-This tests to make sure that content that is colored by the user is pasted with that color during a Paste as Quotation.
-<blockquote><span class="Apple-style-span" style="color: red;">This text should be red (it should be wrapped in a style span).</span></blockquote>
+Viewer: SetWindow XID 62914598 size 100:100
+layer at (0,0) size 800x600
+  RenderView at (0,0) size 800x600
+layer at (0,0) size 800x52
+  RenderBlock {HTML} at (0,0) size 800x52
+    RenderBody {BODY} at (8,16) size 784x20
+      RenderBlock {P} at (0,0) size 784x20
+        RenderText {#text} at (0,0) size 364x19
+          text run at (0,0) width 364: "This testcase should not fire an assertion related to clip rects."
+layer at (8,52) size 122x227 clip at (9,53) size 120x225
+  RenderBlock (positioned) {DIV} at (8,52) size 122x227 [border: (1px solid #000000)]
+    RenderBlock (anonymous) at (11,11) size 100x105
+      RenderEmbeddedObject {OBJECT} at (0,0) size 100x100
+      RenderText {#text} at (0,0) size 0x0
+layer at (19,168) size 100x100
+  RenderBlock {DIV} at (11,116) size 100x100 [bgcolor=#0000FF]