Rename spellchecker preprocessor flag

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 052d297086f66b353cf45ca8043404dfd1aeb834..cff76ce3e44ba9364092f63244da1ad26069705f 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -573,7 +573,7 @@
 
       # Use the operating system spellchecker, e.g. NSSpellChecker on Mac or
       # SpellCheckerSession on Android.
-      'use_platform_spellchecker%': 0,
+      'use_browser_spellchecker%': 0,
 
       # Webrtc compilation is enabled by default. Set to 0 to disable.
       'enable_webrtc%': 1,
@@ -829,7 +829,7 @@
 
         # Android and OSX have built-in spellcheckers that can be utilized.
         ['OS=="android" or OS=="mac"', {
-          'use_platform_spellchecker%': 1,
+          'use_browser_spellchecker%': 1,
         }],
 
         # Android OS includes support for proprietary codecs regardless of
@@ -1211,7 +1211,7 @@
     'enable_basic_printing%': '<(enable_basic_printing)',
     'enable_print_preview%': '<(enable_print_preview)',
     'enable_spellcheck%': '<(enable_spellcheck)',
-    'use_platform_spellchecker%': '<(use_platform_spellchecker)',
+    'use_browser_spellchecker%': '<(use_browser_spellchecker)',
     'enable_google_now%': '<(enable_google_now)',
     'cld_version%': '<(cld_version)',
     'cld2_table_size%': '<(cld2_table_size)',
@@ -3010,8 +3010,8 @@
       ['enable_spellcheck==1', {
         'defines': ['ENABLE_SPELLCHECK=1'],
       }],
-      ['use_platform_spellchecker', {
-        'defines': ['USE_PLATFORM_SPELLCHECKER=1'],
+      ['use_browser_spellchecker', {
+        'defines': ['USE_BROWSER_SPELLCHECKER=1'],
       }],
       ['enable_captive_portal_detection==1', {
         'defines': ['ENABLE_CAPTIVE_PORTAL_DETECTION=1'],