Remove obsolete override "ios_extra_version_path".

Chrome on iOS is aligning with the rest of Chrome and no longer uses
"ios_extra_version_path". Remove it from version_info components and
remove the "gclient" hook that generated ios/build/util/CANARY_VERSION.

BUG=591419

Review URL: https://codereview.chromium.org/1784783002

Cr-Commit-Position: refs/heads/master@{#380394}
(cherry picked from commit 39e8a6f)

Review URL: https://codereview.chromium.org/1784563003 .

Cr-Commit-Position: refs/branch-heads/2661@{crosswalk-project#180}
Cr-Branched-From: ef6f6ae-refs/heads/master@{#378081}

DEPS

@@ -633,13 +633,6 @@ hooks = [
                '-s', 'src/third_party/WebKit',
                '-o', 'src/build/util/LASTCHANGE.blink'],
   },
-  {
-    # Update CANARY_VERSION.
-    'name': 'ios_canary_version',
-    'pattern': '.',
-    'action': ['python', 'src/ios/build/util/canary_version.py',
-               '-o', 'src/ios/build/util/CANARY_VERSION'],
-  },
   # Pull GN binaries. This needs to be before running GYP below.
   {
     'name': 'gn_win',

components/version_info.gypi

@@ -4,12 +4,6 @@
 
 {
   'variables': {
-    # Some plaform want to override part of the version number generation
-    # (for example iOS uses a different value for PATCH level for canary).
-    # This can be done settings "extra_version_path" variable to the path
-    # of a file with the corresponding value overrides. If present it will
-    # be loaded after all other input files.
-    'extra_version_name': '',
     'conditions': [
       ['branding == "Chrome"', {
         'use_unofficial_version_number%': 0,
@@ -93,35 +87,8 @@
             '<(template_input_path)',
             '<@(_outputs)',
           ],
-          'conditions': [
-            ['extra_version_name!=""', {
-              'variables': {
-                'extra_version_flags': [
-                  '-f', '<(extra_version_name)',
-                ],
-              },
-              'inputs': [
-                '<(extra_version_name)'
-              ],
-            }],
-          ],
         },
       ],
     },
   ],
-  'conditions': [
-    ['OS=="ios"', {
-      'variables': {
-        # Use nested 'variables' to workaround how variables work with gyp (no
-        # determined ordering and thuse it is not possible to define a variable
-        # in function of another).
-        'variables': {
-          # Path to the file used to override the version PATH level on iOS.
-          # Default to ios/build/util/VERSION.
-          'ios_extra_version_path%': '../ios/build/util/VERSION',
-        },
-        'extra_version_name': '<(ios_extra_version_path)'
-      },
-    }],
-  ],
 }

components/version_info/BUILD.gn

@@ -6,12 +6,6 @@ import("//build/config/chrome_build.gni")
 import("//chrome/version.gni")
 
 declare_args() {
-  if (is_ios) {
-    # Path to the file used to override the version PATH level on iOS.
-    # Default to ios/build/util/VERSION.
-    ios_extra_version_path = "//ios/build/util/VERSION"
-  }
-
   use_unofficial_version_number = !is_chrome_branded
 }
 
@@ -36,19 +30,4 @@ source_set("version_info") {
 process_version("generate_version_info") {
   template_file = "version_info_values.h.version"
   output = "$target_gen_dir/version_info_values.h"
-
-  if (is_ios) {
-    # iOS overrides PATCH level of the version with the value from the file
-    # named by ios_version_path, however, this needs to be the last argument
-    # to the version.py script, so it cannot be added to the sources variable
-    # and instead need to be managed manually.
-
-    inputs = [
-      ios_extra_version_path,
-    ]
-    extra_args = [
-      "-f",
-      rebase_path(ios_extra_version_path, root_build_dir),
-    ]
-  }
 }