GN: Use implicit dependency for binary input deps

tools/gn/variables.cc

Index: tools/gn/variables.cc
diff --git a/tools/gn/variables.cc b/tools/gn/variables.cc
index 3c717d82ed60346525b47141581c1cef0e613b35..7b2c4a088f7c6b1947e0edff16f022f7055b936b 100644
--- a/tools/gn/variables.cc
+++ b/tools/gn/variables.cc
@@ -1048,13 +1048,11 @@ const char kInputs_Help[] =
     "  files in a target are compiled. So if you depend on generated headers,\n"
     "  you do not typically need to list them in the inputs section.\n"
     "\n"
-    "  Inputs for binary targets will be treated as order-only dependencies,\n"
-    "  meaning that they will be forced up to date before compiling or\n"
-    "  any files in the target, but changes in the inputs will not\n"
-    "  necessarily force the target to compile. This is because it is\n"
-    "  expected that the compiler will report the precise list of input\n"
-    "  dependencies required to recompile each file once the initial build\n"
-    "  is done.\n"
+    "  Inputs for binary targets will be treated as implicit dependencies,\n"
+    "  meaning that changes in any of the inputs will force all sources in\n"
+    "  the target to be recompiled. If an input only applies to a subset of\n"
+    "  source files, you may want to split those into a separate target to\n"
+    "  avoid unnecessary recompiles.\n"
     "\n"
     "Example\n"
     "\n"