Remove parts of //cc we aren't using

cc/base/blocking_task_runner.cc

Index: cc/base/blocking_task_runner.cc
diff --git a/cc/trees/blocking_task_runner.cc b/cc/base/blocking_task_runner.cc
similarity index 95%
rename from cc/trees/blocking_task_runner.cc
rename to cc/base/blocking_task_runner.cc
index 1111e9bf4b72fd842444b5a939cd3115dc9c0aa0..d19d237546c4bd6a1a0f0ba425101384322135ce 100644
--- a/cc/trees/blocking_task_runner.cc
+++ b/cc/base/blocking_task_runner.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "cc/trees/blocking_task_runner.h"
+#include "cc/base/blocking_task_runner.h"
 
 #include <utility>
 
@@ -25,7 +25,8 @@ BlockingTaskRunner::BlockingTaskRunner(
       capture_(0) {
 }
 
-BlockingTaskRunner::~BlockingTaskRunner() {}
+BlockingTaskRunner::~BlockingTaskRunner() {
+}
 
 bool BlockingTaskRunner::BelongsToCurrentThread() {
   return base::PlatformThread::CurrentId() == thread_id_;