Minimise logging in release branch.

Disable NOTIMPLEMENTED() as the messages generated are not actionable by
app developers.

Bug: 15303655
Change-Id: I8d52c69874fe2818ac58235d9441936798dc60d6
(cherry picked from commit bf063fe8d7408cd65ec84b146e4254baa2aa7055)
diff --git a/base/logging.h b/base/logging.h
index 1a110a5..722669e 100644
--- a/base/logging.h
+++ b/base/logging.h
@@ -853,8 +853,8 @@
 #if defined(OS_ANDROID) && defined(OFFICIAL_BUILD)
 #define NOTIMPLEMENTED_POLICY 0
 #else
-// Select default policy: LOG(ERROR)
-#define NOTIMPLEMENTED_POLICY 4
+// WebView: Hide NOTIMPLEMENTED entirely in Android release branch.
+#define NOTIMPLEMENTED_POLICY 0
 #endif
 #endif