Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/glob/CHANGELOG.md

Index: mojo/public/dart/third_party/glob/CHANGELOG.md
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+## 1.0.5
+
+* Narrow the dependency on `path`. Previously, this allowed versions that didn't
+  support all the functionality this package needs.
+
+* Upgrade to the new test runner.
+
+## 1.0.4
+
+* Added overlooked `collection` dependency.
+
+## 1.0.3
+
+* Fix a bug where `Glob.list()` and `Glob.listSync()` would incorrectly throw
+  exceptions when a directory didn't exist on the filesystem.
+
+## 1.0.2
+
+* Fixed `Glob.list()` on Windows.
+
+## 1.0.1
+
+* Fix several analyzer warnings.
+
+* Fix the tests on Windows.