Merge the two dartdoc smoke tests (#7443)

We were checking similar things in two places. Now we check everything in one
place.

dev/bots/docs.sh

@@ -9,28 +9,6 @@ pub global activate dartdoc 0.9.9
 (cd dev/tools; pub get)
 FLUTTER_ROOT=$PWD dart dev/tools/dartdoc.dart
 
-# Smoke test the docs to make sure we have all the major kinds of things.
-
-if [[ ! -f dev/docs/doc/flutter/widgets/Widget/Widget.html ]]; then
-  echo 'Failed to find documentation for Widget class. Are the docs complete?'
-  exit 1
-fi
-
-if [[ ! -f dev/docs/doc/flutter/dart-io/File/File.html ]]; then
-  echo 'Failed to find documentation for File class. Are the docs complete?'
-  exit 1
-fi
-
-if [[ ! -f dev/docs/doc/flutter/dart-ui/Canvas/drawRect.html ]]; then
-  echo 'Failed to find documentation for Canvas.drawRect. Are the docs complete?'
-  exit 1
-fi
-
-if [[ ! -f dev/docs/doc/flutter/flutter_test/WidgetTester/pumpWidget.html ]]; then
-  echo 'Failed to find documentation for WidgetTester.pumpWidget. Are the docs complete?'
-  exit 1
-fi
-
 # Ensure google webmaster tools can verify our site.
 cp dev/docs/google2ed1af765c529f57.html dev/docs/doc
 

dev/tools/dartdoc.dart

@@ -87,10 +87,13 @@ dependencies:
 
 void sanityCheckDocs() {
   List<String> canaries = <String>[
+    '$kDocRoot/api/dart-io/File-class.html',
+    '$kDocRoot/api/dart-ui/Canvas-class.html',
+    '$kDocRoot/api/dart-ui/Canvas/drawRect.html',
+    '$kDocRoot/api/flutter_test/WidgetTester/pumpWidget.html',
     '$kDocRoot/api/material/Material-class.html',
     '$kDocRoot/api/material/Tooltip-class.html',
     '$kDocRoot/api/widgets/Widget-class.html',
-    '$kDocRoot/api/dart-ui/Canvas-class.html',
   ];
   for (String canary in canaries) {
     if (!new File(canary).existsSync())