Remove unneeded files from third_party/polymer.

third_party/polymer/v1_0/components-chromium/paper-dialog/hero.svg

Index: third_party/polymer/v1_0/components-chromium/paper-dialog/hero.svg
diff --git a/third_party/polymer/v1_0/components-chromium/paper-dialog/hero.svg b/third_party/polymer/v1_0/components-chromium/paper-dialog/hero.svg
deleted file mode 100644
index 713329b847015fb2f882515f085829388748c399..0000000000000000000000000000000000000000
--- a/third_party/polymer/v1_0/components-chromium/paper-dialog/hero.svg
+++ /dev/null
@@ -1,58 +0,0 @@
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-<g id="Guides">
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