Remove the deprecated static metrics APIs.

src/platform/metrics/README

Index: src/platform/metrics/README
diff --git a/src/platform/metrics/README b/src/platform/metrics/README
index d8f17c4445fc801774fb9e818c2aa43f4b4a191b..6d011dbfd05eaea7ef6bc8d234427b82f84dca5e 100644
--- a/src/platform/metrics/README
+++ b/src/platform/metrics/README
@@ -42,14 +42,9 @@ a module, you need to do the following:
                                      int max)
   sends a sample for an enumeration (linear) histogram.
 
-  Currently, the API also includes two deprecated static methods:
-
-  bool MetricsLibrary::SendToChrome(const std::string& name, int sample,
-                                    int min, int max, int nbuckets)
-  bool MetricsLibrary::SendEnumToChrome(const std::string& name, int sample,
-                                        int max)
-
-  See the API documentation in metrics_library.h under
+  Before using these methods, a MetricsLibrary object needs to be
+  constructed and initialized through its Init method. See the
+  complete API documentation in metrics_library.h under
   src/platform/metrics/.
 
 - On the target platform, shortly after the sample is sent it should