metrics: fix lint warnings

This CL solve the cros lint warnings.
This is mostly due to:
* header guards
* include path
* few google style guide warnings

BUG=chromium:389229
TEST=FEATURES=test emerge-amd64-generic metrics

Change-Id: Ibbfcd2c88926bcc0c1ce9275b4ad0fb0748cd4de
Reviewed-on: https://chromium-review.googlesource.com/207248
Reviewed-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Bertrand Simonnet <bsimonnet@chromium.org>
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
Reviewed-by: Luigi Semenzato <semenzato@chromium.org>
diff --git a/metrics/timer_mock.h b/metrics/timer_mock.h
index 6034ee3..6eef761 100644
--- a/metrics/timer_mock.h
+++ b/metrics/timer_mock.h
@@ -11,7 +11,7 @@
 #include <base/basictypes.h>
 #include <gmock/gmock.h>
 
-#include "timer.h"
+#include "metrics/timer.h"
 
 namespace chromeos_metrics {
 
@@ -26,7 +26,7 @@
 
 class TimerReporterMock : public TimerReporter {
  public:
-  TimerReporterMock() : TimerReporter("",0,0,0) {}
+  TimerReporterMock() : TimerReporter("", 0, 0, 0) {}
   MOCK_METHOD0(Start, bool());
   MOCK_METHOD0(Stop, bool());
   MOCK_METHOD0(Reset, bool());