Remove stale platform-specific expectations

LayoutTests/platform/linux/tables/mozilla/images/adforce_imgis_com-expected.txt

Index: LayoutTests/platform/linux/tables/mozilla/images/adforce_imgis_com-expected.txt
diff --git a/LayoutTests/platform/linux/tables/mozilla/images/adforce_imgis_com-expected.txt b/LayoutTests/platform/linux/tables/mozilla/images/adforce_imgis_com-expected.txt
deleted file mode 100644
index af339dd4a02ea55004a2bdb3ef83d01fa72501b7..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/linux/tables/mozilla/images/adforce_imgis_com-expected.txt
+++ /dev/null
@@ -1,14 +0,0 @@
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-layer at (0,0) size 800x600
-  RenderBlock {HTML} at (0,0) size 800x600
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-      RenderText {#text} at (0,0) size 60x19
-        text run at (0,0) width 60: "GIF89a\x{D4}\x{1}"
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-      RenderText {#text} at (376,0) size 137x19
-        text run at (376,0) width 137: "<\x{FFFD}\x{FFFD}\x{FFFD},\x{FFFD}\x{FFFD}\x{FFFD}\x{FFFD}\x{D4}\x{1}"
-      RenderText {#text} at (513,0) size 650x39
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