Make extensions::DictionaryBuilder and extensions::ListValue unmovable.

There's no reason for these classes to be movable. std::move() is just
being used as a synonym for Build().

In addition:
- Build() is fewer characters than std::move().
- clang-format works better when builder syntax is consistently used,
  which makes it easier for readers to visually match up deeply nested
  builders.
- It's surprising to see std::move() used with what looks like a
  temporary.

BUG=none

Review URL: https://codereview.chromium.org/1739183003

Cr-Commit-Position: refs/heads/master@{#378107}
diff --git a/chrome/browser/extensions/extension_web_ui_unittest.cc b/chrome/browser/extensions/extension_web_ui_unittest.cc
index 12cb23a2..f75a531 100644
--- a/chrome/browser/extensions/extension_web_ui_unittest.cc
+++ b/chrome/browser/extensions/extension_web_ui_unittest.cc
@@ -77,10 +77,10 @@
   manifest.Set(manifest_keys::kName, "ext1")
       .Set(manifest_keys::kVersion, "0.1")
       .Set(std::string(manifest_keys::kChromeURLOverrides),
-           std::move(DictionaryBuilder().Set("bookmarks", kOverrideResource)));
+           DictionaryBuilder().Set("bookmarks", kOverrideResource).Build());
   scoped_refptr<Extension> ext_unpacked(
       ExtensionBuilder()
-          .SetManifest(std::move(manifest))
+          .SetManifest(manifest.Build())
           .SetLocation(Manifest::UNPACKED)
           .SetID("abcdefghijabcdefghijabcdefghijaa")
           .Build());
@@ -112,10 +112,10 @@
   manifest2.Set(manifest_keys::kName, "ext2")
       .Set(manifest_keys::kVersion, "0.1")
       .Set(std::string(manifest_keys::kChromeURLOverrides),
-           std::move(DictionaryBuilder().Set("bookmarks", kOverrideResource2)));
+           DictionaryBuilder().Set("bookmarks", kOverrideResource2).Build());
   scoped_refptr<Extension> ext_component(
       ExtensionBuilder()
-          .SetManifest(std::move(manifest2))
+          .SetManifest(manifest2.Build())
           .SetLocation(Manifest::COMPONENT)
           .SetID("bbabcdefghijabcdefghijabcdefghij")
           .Build());