Don't compile code for desktop zoom or GuestViews on mobile platforms.

content/shell/browser/shell_browser_context.cc

Index: content/shell/browser/shell_browser_context.cc
diff --git a/content/shell/browser/shell_browser_context.cc b/content/shell/browser/shell_browser_context.cc
index 90f18e9ac8b96fc95361ad4275c992dc92bf5404..c0d111282480bc7d0e15f32c5c71f804521c1d47 100644
--- a/content/shell/browser/shell_browser_context.cc
+++ b/content/shell/browser/shell_browser_context.cc
@@ -123,10 +123,12 @@ void ShellBrowserContext::InitWhileIOAllowed() {
   BrowserContext::Initialize(this, path_);
 }
 
+#if !defined(OS_ANDROID)
 std::unique_ptr<ZoomLevelDelegate> ShellBrowserContext::CreateZoomLevelDelegate(
     const base::FilePath&) {
   return std::unique_ptr<ZoomLevelDelegate>();
 }
+#endif  // !defined(OS_ANDROID)
 
 base::FilePath ShellBrowserContext::GetPath() const {
   return path_;