Update Feedback app icons for MD compliance

New icons are circular an have correct padding.
Replaced 32 and 64px with 48 and 192px icons to cover a wider range
of scales.

Bug: 882176
Test: manual
Change-Id: Ib3d084297bdbd81d778bc15ee64cb1cf8578669a
Reviewed-on: https://chromium-review.googlesource.com/1219774Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Vladislav Kaznacheev <kaznacheev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590359}

chrome/browser/resources/component_extension_resources.grd

@@ -51,8 +51,8 @@
         <include name="IDR_FEEDBACK_TOPBAR_HANDLER_JS" file="feedback/js/topbar_handlers.js" flattenhtml="true" type="BINDATA" />
         <include name="IDR_FEEDBACK_FEEDBACK_CSS" file="feedback/css/feedback.css" type="BINDATA" />
         <include name="IDR_FEEDBACK_SYSINFO_CSS" file="feedback/css/sys_info.css" type="BINDATA" />
-        <include name="IDR_FEEDBACK_ICON_32" file="feedback/images/icon32.png" type="BINDATA" />
-        <include name="IDR_FEEDBACK_ICON_64" file="feedback/images/icon64.png" type="BINDATA" />
+        <include name="IDR_FEEDBACK_ICON_48" file="feedback/images/icon48.png" type="BINDATA" />
+        <include name="IDR_FEEDBACK_ICON_192" file="feedback/images/icon192.png" type="BINDATA" />
       </if>
       <include name="IDR_IDENTITY_API_SCOPE_APPROVAL_BACKGROUND_JS" file="identity_scope_approval_dialog/background.js" type="BINDATA" />
       <include name="IDR_IDENTITY_API_SCOPE_APPROVAL_DIALOG_CSS" file="identity_scope_approval_dialog/scope_approval_dialog.css" type="BINDATA" />

chrome/browser/resources/feedback/manifest.json

@@ -7,8 +7,8 @@
   "incognito" : "split",
   "description": "User feedback extension",
   "icons": {
-    "32": "images/icon32.png",
-    "64": "images/icon64.png"
+    "48": "images/icon48.png",
+    "192": "images/icon192.png"
   },
   "permissions": [
       "feedbackPrivate",