Remove gcc_version from gyp and gn files.

build/config/compiler/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/nacl/config.gni")
 import("//build/toolchain/ccache.gni")
 
 if (current_cpu == "arm") {
   import("//build/config/arm.gni")
 }
 if (current_cpu == "mipsel" || current_cpu == "mips64el") {
   import("//build/config/mips.gni")
 }
-if (is_posix) {
-  import("//build/config/gcc/gcc_version.gni")
-}
 if (is_win) {
   import("//build/config/win/visual_studio_version.gni")
 }
 
 declare_args() {
   # Default to warnings as errors for default workflow, where we catch
   # warnings with known toolchains. Allow overriding this e.g. for Chromium
   # builds on Linux that could use a different version of the compiler.
   treat_warnings_as_errors = true
 
@@ skipping 758 matching lines @@
       cflags += [ "-Werror" ]
     }
 
     if (is_mac && !is_nacl) {
       # When compiling Objective-C, warns if a method is used whose
       # availability is newer than the deployment target. This is not
       # required when compiling Chrome for iOS.
       cflags += [ "-Wpartial-availability" ]
     }
 
-    if (gcc_version >= 48) {
-      cflags_cc += [
-        # See comment for -Wno-c++11-narrowing.
-        "-Wno-narrowing",
-      ]
-      if (!is_clang && is_chromeos) {
-        cflags_cc += [
-          # TODO(thakis): Remove, http://crbug.com/263960
-          "-Wno-literal-suffix",
-        ]
-      }
-    }
-
     # Suppress warnings about ABI changes on ARM (Clang doesn't give this
     # warning).
     if (current_cpu == "arm" && !is_clang) {
       cflags += [ "-Wno-psabi" ]
     }
 
-    if (gcc_version >= 48) {
+    if (!is_clang) {
+      cflags_cc += [
+        # See comment for -Wno-c++11-narrowing.
+        "-Wno-narrowing",
+      ]
+
       # Don't warn about the "typedef 'foo' locally defined but not used"
       # for gcc 4.8.
       # TODO: remove this flag once all builds work. See crbug.com/227506
       cflags += [ "-Wno-unused-local-typedefs" ]
     }
   }
 
   # Common Clang and GCC warning setup.
   if (!is_win || is_clang) {
     cflags += [
       # Disables.
       "-Wno-missing-field-initializers",  # "struct foo f = {0};"
       "-Wno-unused-parameter",  # Unused function parameters.
     ]
   }
 
+  if (is_chromeos) {
+    # TODO(thakis): Remove, http://crbug.com/263960
+    if (is_clang) {
+      cflags_cc += [ "-Wno-reserved-user-defined-literal" ]
+    } else {
+      cflags_cc += [ "-Wno-literal-suffix" ]
+    }
+  }
+
   if (is_clang) {
     cflags += [
       # TODO(thakis): Add -Wfor-loop-analysis to -Wall in clang, remove this:
       "-Wfor-loop-analysis",
 
       # TODO(thakis): Consider -Wloop-analysis (turns on
       # -Wrange-loop-analysis too).
 
       # This warns on using ints as initializers for floats in
       # initializer lists (e.g. |int a = f(); CGSize s = { a, a };|),
@@ skipping 12 matching lines @@
 
       # TODO(thakis): This used to be implied by -Wno-unused-function,
       # which we no longer use. Check if it makes sense to remove
       # this as well. http://crbug.com/316352
       "-Wno-unneeded-internal-declaration",
 
       # TODO(hans): Get this cleaned up, http://crbug.com/428099
       "-Wno-inconsistent-missing-override",
     ]
 
-    if (is_chromeos) {
-      cflags += [
-        # TODO(thakis): Remove, http://crbug.com/263960
-        "-Wno-reserved-user-defined-literal",
-      ]
-    }
-
     # NaCl's Clang compiler and Chrome's hermetic Clang compiler will almost
     # always have different versions. Certain flags may not be recognized by
     # one version or the other.
     if (!is_nacl) {
       # Flags NaCl (Clang 3.7) does not recognize.
       cflags += [
         # TODO(thakis): Enable this, crbug.com/507717
         "-Wno-shift-negative-value",
       ]
     }
@@ skipping 412 matching lines @@
   if (symbol_level == 0) {
     configs = [ ":no_symbols" ]
   } else if (symbol_level == 1) {
     configs = [ ":minimal_symbols" ]
   } else if (symbol_level == 2) {
     configs = [ ":symbols" ]
   } else {
     assert(false)
   }
 }