Rewrite editing/inserting/edited-whitespace-1.html to utilize assert_selection()

third_party/WebKit/LayoutTests/platform/mac/editing/inserting/edited-whitespace-1-expected.txt

Index: third_party/WebKit/LayoutTests/platform/mac/editing/inserting/edited-whitespace-1-expected.txt
diff --git a/third_party/WebKit/LayoutTests/platform/mac/editing/inserting/edited-whitespace-1-expected.txt b/third_party/WebKit/LayoutTests/platform/mac/editing/inserting/edited-whitespace-1-expected.txt
deleted file mode 100644
index 0de341cd6559d3b4be618d6d06d7892d92d0a1ec..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/platform/mac/editing/inserting/edited-whitespace-1-expected.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-layer at (0,0) size 800x600
-  LayoutView at (0,0) size 800x600
-layer at (0,0) size 800x600
-  LayoutBlockFlow {HTML} at (0,0) size 800x600
-    LayoutBlockFlow {BODY} at (8,8) size 784x576
-      LayoutBlockFlow {P} at (0,0) size 784x36
-        LayoutText {#text} at (0,0) size 780x36
-          text run at (0,0) width 321: "This tests that edited whitespaces aren't all nbsps. "
-          text run at (320,0) width 460: "When the region becomes non-editable, Hello and World should still be"
-          text run at (0,18) width 118: "on different lines. "
-          text run at (117,18) width 594: "This demonstrates a bug: the div's focus halo doesn't go away when it becomes non-editable."
-      LayoutBlockFlow {DIV} at (0,52) size 62x38 [border: (1px solid #000000)]
-        LayoutText {#text} at (1,1) size 56x36
-          text run at (1,1) width 56: " Hello    "
-          text run at (1,19) width 44: "World "
-      LayoutBlockFlow {OL} at (0,106) size 784x0
-caret: position 17 of child 0 {#text} of child 2 {DIV} of body