Fix extensions compile issues for Android on sync_unit_tests.

chrome/browser/extensions/extension_infobar_delegate.cc

Index: chrome/browser/extensions/extension_infobar_delegate.cc
diff --git a/chrome/browser/extensions/extension_infobar_delegate.cc b/chrome/browser/extensions/extension_infobar_delegate.cc
index e5ad10b3a0e34b5251b923e28249afdda045c092..ddbee6b9336e3a3ff2536eb5c682f3e6e0d60dd4 100644
--- a/chrome/browser/extensions/extension_infobar_delegate.cc
+++ b/chrome/browser/extensions/extension_infobar_delegate.cc
@@ -42,6 +42,10 @@ ExtensionInfoBarDelegate::ExtensionInfoBarDelegate(
   // TODO(pkasting): Once Infobars have been ported to Mac, we can remove the
   // ifdefs and just use the Infobar constant below.
   int default_height = 36;
+#elif defined(OS_ANDROID)
+  // TODO(dtrainor): This is not used.  Might need to pull this from Android UI
+  // level in the future.  Tracked via issue 115303.
+  int default_height = 36;
 #endif
   height_ = std::max(0, height);
   height_ = std::min(2 * default_height, height_);