cocoa browser: remove non-MD location bar support

chrome/browser/ui/cocoa/location_bar/selected_keyword_decoration.mm

Index: chrome/browser/ui/cocoa/location_bar/selected_keyword_decoration.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/selected_keyword_decoration.mm b/chrome/browser/ui/cocoa/location_bar/selected_keyword_decoration.mm
index a209a2ed72bbf389b9818aa635e38d8f82d2f200..426c4d139f407ba1020fc470672ef742e1be79c0 100644
--- a/chrome/browser/ui/cocoa/location_bar/selected_keyword_decoration.mm
+++ b/chrome/browser/ui/cocoa/location_bar/selected_keyword_decoration.mm
@@ -15,12 +15,6 @@
 #include "ui/gfx/color_palette.h"
 
 SelectedKeywordDecoration::SelectedKeywordDecoration() {
-  if (!ui::MaterialDesignController::IsModeMaterial()) {
-    search_image_.reset([OmniboxViewMac::ImageForResource(
-        IDR_KEYWORD_SEARCH_MAGNIFIER) retain]);
-    SetTextColor([NSColor blackColor]);
-    return;
-  }
   // Note: the unit test
   // SelectedKeywordDecorationTest.UsesPartialKeywordIfNarrow expects to work
   // with a fully-initialized SelectedKeywordDecoration (i.e. one that has a
@@ -35,9 +29,6 @@
 SelectedKeywordDecoration::~SelectedKeywordDecoration() {}
 
 NSColor* SelectedKeywordDecoration::GetBackgroundBorderColor() {
-  if (!ui::MaterialDesignController::IsModeMaterial()) {
-    return skia::SkColorToCalibratedNSColor(gfx::kGoogleBlue700);
-  }
   return skia::SkColorToSRGBNSColor(gfx::kGoogleBlue700);
 }
 
@@ -69,9 +60,7 @@
                                            bool is_extension_keyword) {
   const base::string16 min_name(
       location_bar_util::CalculateMinString(short_name));
-  const int keyword_text_id = ui::MaterialDesignController::IsModeMaterial()
-                                  ? IDS_OMNIBOX_KEYWORD_TEXT_MD
-                                  : IDS_OMNIBOX_KEYWORD_TEXT;
+  const int keyword_text_id = IDS_OMNIBOX_KEYWORD_TEXT_MD;
 
   NSString* full_string =
       is_extension_keyword