Make callers of CommandLine use it via the base:: namespace.

Covers testing/, tools/, ui/, and win8/.

BUG=422426
TEST=none
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Review URL: https://codereview.chromium.org/819223002

Cr-Commit-Position: refs/heads/master@{#309538}
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index 088f6ec..0e917265 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -88,7 +88,7 @@
       weak_ptr_factory_(this) {
   root_web_layer_ = cc::Layer::Create();
 
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 
   cc::LayerTreeSettings settings;
   // When impl-side painting is enabled, this will ensure PictureLayers always